Circuits and Circuit Elements Section Review Worksheet Answer Key
Electrical Circuits Review
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Function B: Multiple Choice
8. If an electric circuit was analogous to a water park, then the battery would be analogous to the ____.
a. pipes which acquit the h2o through the water circuitb. pump which supplies free energy to move the water from the ground to a high elevation
c. the people which flow from the top of the water ride to the bottom of the water ride
d. the rate at which water is pumped onto the slide
eastward. the change in potential energy of the riders
f. the top of the h2o slide
g. the lesser of the h2o slide
h. the long lines which exist at the park
i. the speed at which riders movement as they slide from the top to the bottom of the ride
Respond: B
A water ride at a h2o park is analogous to an electric circuit. First of all, there is an entity which flows - water flows in a h2o park and (in conventional terms) + charge flows in an electric excursion. In each example, the fluid flows spontaneously from a high free energy location to a low energy location. The flow is through pipes (or slides) in a water park and through wires in an electric excursion. If the pipes or the wires are broken, then there can be no continuous flow of fluid through the excursion. A complete loop is required to establish the circuit.
This flow of fluid - whether of water or charge - is possible when a pressure level difference is created between ii locations in the circuit. In the h2o park, the pressure difference is the difference in h2o pressure created by ii locations of different heights. H2o flows spontaneously from locations of loftier pressure (loftier distance) to locations of low pressure level (low altitude). In an electric circuit, the electric potential difference between the 2 terminals of a battery or free energy source provides the electric force per unit area which presses on accuse to move them from a location of high pressure (high electric potential) to a location of low pressure (low electrical potential).
Energy is required to move the fluid uphill. In a water park, a water pump is used to do work upon the water in guild to heighten information technology from the low height back up to the high tiptop. The water pump does not supply the h2o; the h2o which is already in the pipes. Rather, the water pump supplies the energy to pump the water from the location of depression energy and low pressure to the location of loftier energy and high pressure. In an electric circuit, the battery is the accuse pump which pumps the charge through the bombardment from the location of low electric potential free energy (the - terminal) to the location of loftier electric potential energy (the + last). The battery does not supply the electric charge; the charge is already in the wires. The battery only supplies the free energy to do piece of work on the charge in pumping information technology uphill.
nine. If an electric circuit was analogous to a water park, and so the positive final of the bombardment would be analogous to the ____.
a. pipes which carry the h2o through the h2o excursionb. pump which supplies energy to move the water from the ground to a high tiptop
c. the people which period from the top of the h2o ride to the bottom of the h2o ride
d. the rate at which water is pumped onto the slide
e. the change in potential energy of the riders
f. the acme of the water slide
grand. the bottom of the water slide
h. the long lines which be at the park
i. the speed at which riders move as they slide from the superlative to the bottom of the ride
Answer: F
A water ride at a water park is analogous to an electric circuit. First of all, in that location is an entity which flows - h2o flows in a water park and (in conventional terms) + charge flows in an electric excursion. In each case, the fluid flows spontaneously from a high energy location to a low free energy location. The menstruation is through pipes (or slides) in a water park and through wires in an electric circuit. If the pipes or the wires are cleaved, and so there tin can be no continuous flow of fluid through the circuit. A consummate loop is required to establish the circuit.
This flow of fluid - whether of water or accuse - is possible when a pressure difference is created between ii locations in the circuit. In the h2o park, the pressure departure is the difference in water pressure created past two locations of unlike heights. Water flows spontaneously from locations of high pressure (loftier altitude) to locations of low pressure level (depression altitude). In an electric circuit, the electric potential departure between the two terminals of a battery or energy source provides the electric force per unit area which presses on charge to movement them from a location of high pressure level (high electric potential) to a location of depression pressure (depression electric potential).
Energy is required to move the fluid uphill. In a water park, a water pump is used to do work upon the h2o in club to raise it from the depression peak support to the high height. The water pump does not supply the water; the water which is already in the pipes. Rather, the water pump supplies the energy to pump the h2o from the location of low energy and low pressure level to the location of high energy and high pressure. In an electric circuit, the battery is the charge pump which pumps the charge through the battery from the location of low electric potential energy (the - concluding) to the location of high electric potential energy (the + concluding). The bombardment does non supply the electric charge; the charge is already in the wires. The battery simply supplies the free energy to do work on the charge in pumping it uphill.
ten. If an electrical circuit was analogous to a water park, then the electric current would exist analogous to the ____.
a. pipes which bear the water through the water circuitb. pump which supplies free energy to move the water from the ground to a high elevation
c. the people which flow from the top of the h2o ride to the lesser of the water ride
d. the rate at which water is pumped onto the slide
east. the change in potential energy of the riders
f. the top of the h2o slide
g. the bottom of the water slide
h. the long lines which be at the park
i. the speed at which riders move equally they slide from the superlative to the bottom of the ride
Answer: D
The flow of water at a water park is analogous to the flow of charge in an electrical circuit. The charge per unit at which charge moves past a point on a circuit equally measured in Coulombs of charge per second (or some comparable set of units) is known as the electric current. In our analogy, the fluid which flows is h2o and the rate at which the fluid passes whatsoever given point is the current.11. The potential energy possessed per unit of charge at any given location is referred to equally the electric ___.
a. current
b. resistance
c. potential
d. ability
Answer: C
This is the definition of electric potential - a concept you should internalize.
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12. Ane ampere is the amount of electric current that exists when ____ flows by a certain bespeak in a usher in ____.
a. ane watt; ane second
b. one joule; one hour
c. one electron; one 2nd
d. i electron; i hr
e. ane volt; one second
f. ane volt; one hour
g. i coulomb; one second
h. 1 coulomb; i hr
Answer: Chiliad
An ampere is a unit of electric current. And electric current is defined as the rate at which charge moves past a point on a excursion as measured in standard units of Coulombs of charge per 2d.
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thirteen. If 6 coulombs of accuse flow past point 'A' in a excursion in 4 seconds, then ____ coulombs of accuse will catamenia by betoken 'A' in 8 seconds.
a. 0.67
b. ane.5
c. 2
d. iii
e. iv
f. 6
g. 8
h. 12
i. 24
Reply: H
The current (I) is the quantity of charge flowing past a bespeak (Q) in a given corporeality of time (t). That is, I = Q/t. Then in this case, the current at point A is (half-dozen C) / (4 s) or 1.5 amperes. Thus the Q/t ratio is 1.5 regardless of the time. So solve the equation
for Q to obtain the answer.
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14. In which of the following situations will the light bulb lite? List all that use.
Answer: DF
For a circuit to be established, there must be a closed conducting loop from the positive terminal to the negative terminal. This would hateful that circuits D, E and F would all exist circuits. But in society for the light seedling to light, it must be included as part of the electric circuit. And so in East, the bulb does not low-cal since the loop does not extend up into and through the light seedling; charge would simple period out of the + concluding battery and directly back into - last the battery.
A simple circuit containing a battery and a low-cal bulb is shown in the diagram at the right. Apply this diagram to reply the next several questions.
15. The current through the battery is ___.
a. greater than that through the low-cal bulb
b. less than that through the light seedling
c. the aforementioned as that through the light seedling
d. greater than that through each wire
east. less than that through each wire
Answer: C
Charge is a conserved quantity; information technology is never gained nor lost. In an electric circuit, the charge present in the wires and conducting elements is what moves through the excursion. This charge is enclosed in the wires and unable to escape (assuming there is no fault in the circuit). Every bit the charge flows, it does not accumulate in a given location. And charge is non used upwardly as though it were a consumable quantity. Nor is charge transformed into some other type of entity. Given all this reasoning, i would conclude that the current at one location in an electrical circuit is the same as the current at any other location in an electric circuit.
16. Charge flowing through this circuit is most energized at ____. Choose the 1 best answer.
a. the + final of the bombardmentb. the - terminal of the bombardment
c. simply prior to entering the light bulb
d. just after exiting the low-cal bulb
e. ... nonsense! The energy of the charge is the aforementioned everywhere throughout the circuit.
Answer: A
The + final of the battery is the high energy terminal of the battery.
17. The function or purpose of the battery in this circuit is to ____. Choose iii.
a. supply electric accuse and so that a current can beb. supply energy to the charge
c. move the charge from the - to the + terminal of the battery
d. transform energy from electrical energy into low-cal energy
eastward. constitute an electric potential difference betwixt the + and - terminals
f. replenish the charge which is lost in the light bulb
g. offer resistance to the period of accuse and then that the lite bulb can get hot
Answer: BCE
To institute an electrical circuit, charge must be moved from depression energy to loftier free energy. One time at high energy, the accuse spontaneously flows through the conducting wires and other conducting elements of the circuit dorsum downwardly to the low free energy final. A battery'southward office is to supply the energy which is required to move the charge from the - terminal to the + terminal of the battery. By placing a large quantity of similar charge at ane location, an electric pressure or potential difference is established, forcing the like charges to move away from this location to the location of opposite charge (the - terminal).
18. A 12-Volt battery would supply ___. List all that apply.
a. iii Coulombs of accuse with 4 Joules of energyb. 4 Coulombs of accuse with iii Joules of free energy
c. 12 Coulombs of accuse with 1 Joule of free energy
d. 1 Coulomb of charge with 12 Joules of energy
due east. 0.five Coulombs of charge with 24 Joules of energy
f. 24 Coulombs of charge with two Joules of energy
Respond: D
Electric potential (or voltage) is defined every bit the electric potential free energy per charge. It is the Joules of free energy per coulomb of charge possessed by some quantity of charge at some location in an electric circuit. A 12 Volt battery moves some quantity of charge from the - last to the + terminal, giving the accuse energy. Each coulomb of charge would learn 12 Joules of free energy. The energy/charge ratio would be 12 J/C.
19. The charges that flow through the wires in your home ____.
a. are stored in the outlets at your homeb. are created when an appliance is turned on
c. originate at the power (free energy) company
d. originate in the wires betwixt your domicile and the power company
east. already exist in the wires at your home
Answer: East
This question targets a common misconception about electric circuits. The misconception presumes that the role of the electrical outlet, the battery, or the power company is to provide the charge required to move through the home. But the power company is just the source of the energy required to set up the charge in motility by the establishment of an electric potential departure. The charge itself is present in the wires and conducting elements of your habitation in the form of mobile electrons.
20. Approximately how long would it accept an electron to travel from the battery of a car to a head lite and back (complete loop)?
a. seconds
b. hours
c. years
d. one-millionth of a 2nd
east. one-10th of a 2nd
Reply: B
Electrical charge drifting through an electric excursion moves at a rather slow pace. Quite surprising to many, the distance traversed per unit of time is on the order of 1 meter per hour.
21. The electrical circuit shown at the right consists of a bombardment and 3 identical calorie-free bulbs. Which of the following statements are true apropos this circuit? List all that apply.
a. The current through point 10 will be greater than that through indicate Z.b. The current through point Z will be greater than that through betoken Y.
c. The electric current will be the same through points X, Y and Z.
d. The current through point X will be greater than that through betoken Y.
east. The current through indicate Y volition be greater than that through indicate Ten.
Answer: C
As discussed in Question #15 higher up , the current in an electric circuit is everywhere the same. So the current at these three locations is the same.
a. The electric potential difference between X and Y is more than that betwixt Y and Z.b. The electric potential difference between Ten and Z is more than than that between Y and West.
c. The electrical potential difference between Ten and Y is the same every bit that between Y and Z.
d. The electric potential divergence between 10 and Z is the same as that betwixt Y and W.
e. The electric potential difference between Y and W is more that between X and Y.
Answer: DE
The electric potential difference across a light bulb (or whatever resistor) in an electric circuit is simply the product of the current at that bulb multiplied by the resistance of the bulb. Each bulb has the same resistance (since they're identical) and the same current (since the electric current is everywhere the aforementioned). And so the electric potential divergence across each bulb is the same. And the potential drop across any two consecutive bulbs is the same. And the potential drop beyond two bulbs would be greater than that across 1 bulb.
a. Conventional current is directed through the external circuit from point X to Y to Z to Due west.b. Conventional current is directed through the external excursion from point W to Z to Y to X.
c. Conventional electric current is directed through the internal circuit from indicate Westward to bespeak X.
d. Conventional current is directed through the internal circuit from signal X to point W.
eastward. The point where charge possesses the least amount of electrical potential energy is point W.
Answer: ACE
The battery is referred to equally the internal circuit. Charge moves in the internal circuit from the - last to the + concluding (in the direction from W towards Z). The wires and calorie-free bulbs comprise the external circuit; charge moves through the external excursion from the + terminal to the - terminal (in the direction of X to Y to Z to West).
24. Voltage ____ an electrical excursion.
a. goes through
b. is expressed across
c. is constant throughout
d. is the charge per unit at which charges move through
Reply: B
Voltage or electric potential is not a matter which moves. Thus, choices A and D are not the answers since they imply move of voltage. And the voltage or electric potential of a charge is not something which is constant throughout the excursion equally choice C suggests.
Voltage or electric potential is a measure of how energized a quantity of charge is at a given location relative to the - final. Information technology is often expressed every bit a departure beyond 2 points. Peradventure you have noted this language of "the potential across ..." in several of the answers in this Review.
25. Two or more of the following words and phrases mean the aforementioned affair. Identify them by listing their letters.
a. Voltage
b. Wattage
c. Electrical Potential Difference
d. Rate at which charge flows
e. Electric Pressure
f. Energy
Respond: ACE
The voltage or electrical potential difference are synonymous terms. Voltage is non synonymous with energy. While voltage (or electric potential difference) is a measure of how energized a quantity of charge is at a given location, voltage is expressed as the free energy per charge (and non merely as energy). Drawing from the analogy between a water park and an electric circuit, voltage is a measure of the quantity of electric pressure placed upon a charge in inducing it to move from ane location to another location.
Wattage is synonymous with power. Current is synonymous with the rate at which charge flows.
26. A high voltage battery can ____.
a. do a lot of work on each charge it encountersb. exercise a lot of work over the course of its lifetime
c. push a lot of charge through a circuit
d. last a long time
Answer: A
Voltage refers to the energy/charge. A battery rated with a high voltage tin do a lot of work per every Coulomb of charge which information technology encounters. It may or may not be able to do a lot of work over its lifetime, depending upon the size of the battery.
27. Which i of the post-obit occurs when a rechargeable battery is recharged?
a. The battery, which has run out of watts, has its wattage restored.b. The bombardment, which has run out of amps, has electric current placed dorsum into it.
c. The battery, which has run out of charge, has accuse returned to information technology.
d. The battery, which has run out of chemical reactants, has its chemicals reformed.
Respond: D
Batteries perform their free energy-supplying tasks by using the energy from an exothermic oxidation-reduction reaction to practice work upon accuse within the electrical circuit. When a battery no longer works, its reactants are consumed to the indicate that the electric potential which the reactants are capable of producing is small compared to the overall resistance of the excursion. At such an instant in time, the power to induce a current is limited to the betoken that the external circuit elements are no longer functional.
Not all batteries are rechargeable. Those that are rechargeable can have the products transformed dorsum into reactants. The recharger utilizes electrical energy from an outlet to reverse the previously exothermic reaction, turning its products dorsum into reactants.
28. Birds can safely stand up on loftier voltage electric power lines. This is because ____.
a. they are at low potential with respect to the basis.b. they offer no resistance to current.
c. they e'er choose power lines that are not in utilize.
d. the potential deviation betwixt their feet is depression.
e. they are perfect insulators.
f. they are perfect conductors.
Answer: D
In society for accuse to flow between two locations, at that place must be an electrical potential difference established between those ii locations. If a bird places its left foot on an electrical electric line and his right pes a few centimeters away on the aforementioned electric power line, and then in that location is little to no difference in potential between his ii feet. Without an electric potential difference, accuse will not flow through the bird and the bird is safe.
29. When the light bulb in your lamp no longer works, it is because the bulb has _____.
a. run out of free energy and tin no longer pump chargeb. run out of voltage and must be recharged
c. run out of electrons and and then at that place is no more current
d. burned all of its watts and can no longer shine
e. tripped a excursion breaker and must be fixed at the fuse box
f. a broken filament which has resulted in an open circuit
g. ... nonsense! The bulb is fine; your family simply needs to fully pay their power bill.
Answer: F
The most common cause for the disability of a low-cal bulbs to light is a broken filament. A coiled wire of tungsten stretches between two vertical supports. If disturbed while hot or if overworn, the tungsten metal can intermission and leave a gap betwixt the two vertical supports. This gap represents a break in the circuit; a closed conducting loop is no longer established and charge will non catamenia.
xxx. A battery is needed in the circuit of your flashlight and then that ____.
a. charge is provided to the wiresb. the energy of the light is counterbalanced by the battery
c. an exothermic, light-creating reaction is possible
d. an electric potential departure is maintained across the circuit
due east. electrons are supplied in society to calorie-free the bulb
Answer: D
One of the roles of a battery is to simply institute a divergence in electrical potential between its two terminals. Charge at the high potential will flow through the external circuit to the low potential location.
31. When you turn on the room lights, they calorie-free immediately. This is best explained past the fact that ____.
a. electrons movement very fast from the switch to the low-cal bulb filamentb. electrons nowadays everywhere in the circuit movement instantly
Answer: B
Electrons move very slowly from i location to another location. But in one case a circuit is closed, they start moving immediately. While electrons move most a meter or in an 60 minutes, the actual signal which tells them to start moving tin can travel at the speed of light. So once the switch is turned on, a signal is circulated throughout the circuit to start the electrons marching. The electrons present in the filament of the circuit.
32. The drift velocity of mobile accuse carriers in electric circuits is ____.
a. very fast; less than just very close to the speed of lightb. fast; faster than the fastest automobile merely nowhere almost the speed of light
c. slow; slower than Michael Jackson runs the 220-meters
d. very slow; slower than a snail
Answer: D
Drift velocity is the distance which a charge moves per unit of time. This value is very small since electrons move very, very slowly. Moving at nigh 1 meter per hour, they are literally slower than a snail.
33. Suppose that the current in a typical circuit (DC) is large. This is an indication that ____.
a. the mobile charge carriers are moving very fastb. a large number of mobile charge carriers are moving forrard per second
c. both a and b are truthful
Reply: B
Electric current (the rate at which charge moves past a point on the excursion) and migrate velocity (the altitude a charge moves in a second) should not exist dislocated (and often are). If a electric current is large, one can be sure of just one thing: a lot of charges are moving forward past a point on the excursion every second.
34. Which of the following statements represent right unit equivalencies? List all that apply.
a. i Ampere = 1 Coulomb / second
b. 1 Joule = 1 Volt / Coulomb
c. 1 Watt = 1 Joule • 2nd
d. 1 Watt = i Volt • Coulomb / second
e. one Joule / Ohm = 1 Ampere • Coulomb
f. 1 Joule • Ohm = 1 Volttwo • second
Answer: ADEF
This question requires a knowledge of both units for electrical quantities and the equations which relate those quantities.
In choice a, an Ampere is a unit of measurement of current (I) and a Coulomb/2d is a unit of charge per unit of fourth dimension (Q/t). This is consistent with the equation I = Q/t.
In choice b, a Joule is a unit of energy (East) and a Volt / Coulomb is a unit of voltage per unit of measurement of charge (V/Q). Since voltage is the energy per charge, we would expect that free energy would be equivalent to voltage • charge. Thus, it is incorrect to equate units of free energy to units of voltage per charge.
In choice c, a Watt is a unit of power (P) and a Joule•second is a unit of free energy (E) multiplied by a unit of fourth dimension (t). But power is energy / time and not free energy • time then this is not a correct unit equivalency.
In choice d, a Watt is a unit of power (P). On the correct side, a Volt is a unit of measurement of voltage (5) and a Coulomb / second is a unit of current (I). So since P = I • Five, this is a correct unit equivalency.
In pick eastward, a Joule / Ohm is a unit of measurement of energy per unit of measurement of resistance (E / R). An Ampere • Coulomb is a unit of current multiplied past a unit of measurement of accuse (I • Q). Thus, the equation is suggesting that E / R = I • Q. This can be rearranged algebraically to say that East / Q = I • R. Since voltage is the energy per accuse (E / Q), the equation can be rewritten equally V = I • R. This is thus a correct unit equivalency.
In pick f, a Joule• Ohm is a unit of measurement of free energy multiplied by a unit of resistance (E • R). A Volttwo / second is a unit of voltageii multiplied past a unit of time (V2 • t). So this equation is suggesting that E • R = Vtwo • t. This can be rearranged algebraically to say that E / t = V2 / R. The right side of the equation is equivalent to power, and so the equation can be rewritten as P = V2 / R. Since this is a correct manner of writing the ability equation, the given unit equivalency is correct.
35. Which of the following diagrams represents resistors connected in in serial? List all that apply.
Reply: B
A and C represent parallel connections as shown past the branching which occurs before and after the resistors. There is no branching in choice B so it is a serial connection of resistors.
36. These two resistors are connected in ____.
a. serial
b. parallel
c. neither
Respond: A
1 can start at the positive terminal of the bombardment and begin tracing their finger along the wire. If there is ever a betoken where the wire comes to a junction and branches in two or more directions, and then the circuit has a parallel connection. Otherwise, information technology is a serial circuit. In this diagram, there is no branching. Thus, it is a series circuit.
37. The electrical potential difference (voltage drop) across each resistor is ___ Volts.
a. half dozen
b. 12
c. 24
d. ... nonsense!. The electric potential difference is dependent upon the actual resistance of the resistors
Answer: A
38. If a third resistor (R3), identical to the other ii, is added in series with the first two, then the overall resistance will ____ and the overall current volition ____.
a. increment, increase
b. decrease, decrease
c. increase, decrease
d. subtract, increase
east. increment, remain the aforementioned
f. decrease, remain the same
g. remain the same, increase
h. remain the same, decrease
i. remain the aforementioned, remain the same
Reply: C
Increasing the number of resistors in a series excursion will increase the overall resistance of that excursion and cause the current to decrease. (The opposite is truthful of a parallel circuit.)
39. If a third resistor (R3), identical to the other two, is added in series with the commencement ii, and so the electrical potential deviation (voltage drop) across each of the three individual resistors volition ____.
a. increase
b. decrease
c. remain the aforementioned
Answer: B
Using the same reasoning as in Question #37, we tin say that the charge will acquire 12 Volts in moving through the battery. It will have to lose this 12 volts in 3 steps as it passes through the external circuit. Since there are now three voltage drops in the external circuit instead of the original two, each drop must exist smaller than before. So at that place will be a 4-Volt drop through each resistor (instead of the original half dozen-Volt drop).
The diagram at the correct shows two identical resistors - R1 and Rtwo - placed in a circuit with a 12-Volt bombardment. Use this diagram to answer the next several questions.
forty. These two resistors are connected in ____.
a. serial
b. parallel
c. neither
Answer: B
One tin can first at the positive concluding of the battery and begin tracing their finger forth the wire. If there is ever a point where the wire comes to a junction and branches in two or more than directions, then the circuit has a parallel connectedness. Otherwise, it is a serial excursion. In this diagram, there is some branching. Once the charge reaches the branching point, information technology will either pass through the resistor in the left branch (Rone) or through the resistor in the right branch (R2). Thus, it is a parallel excursion.
41. The electric potential difference (voltage drop) across each resistor is ___ Volts.
a. half-dozen
b. 12
c. 24
d. ... nonsense!. The electric potential difference is dependent upon the actual resistance of the resistors
Answer: B
Accuse receives an increase in electric potential of 12 volts when moving through the internal circuit (the 
42. If a 3rd resistor (R3), identical to the other 2, is added in parallel with the first 2, then the overall resistance volition ____ and the overall current volition ____.
a. increase, increase
b. decrease, decrease
c. increase, decrease
d. subtract, increase
east. increase, remain the same
f. decrease, remain the aforementioned
1000. remain the aforementioned, increment
h. remain the aforementioned, decrease
i. remain the aforementioned, remain the same
Respond: D
Adding an identical resistor in a separate branch will provide more pathways by which charge tin traverse through the loop of the excursion. This would exist the equivalent of adding another booth at a toll station on a tollway in parallel with an existing booth. Opening up another lane for traffic will reduce the overall resistance and cause an increment in the machine flow charge per unit. The same occurs with accuse in parallel circuits. More branches means less resistance and an increased current.
43. If a tertiary resistor (R3), identical to the other 2, is added in parallel with the first two, then the electrical potential departure (voltage drop) across each of the three individual resistors will ____.
a. increase
b. subtract
c. remain the same
Reply: C
The electric potential difference beyond any branch is equal to the voltage of the battery. Adding a new branch can modify the overall resistance and the overall current, but information technology does not alter the electrical potential difference across the battery nor across the branches.
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44. The resistance of a charge-conveying conducting wire will increment as the ____. Choose all that apply.
a. length of the wire is increasedb. cross-sectional area of the wire is increased
c. temperature of the wire is increased
d. voltage impressed across the ends of the wire is increased
east. wire is placed closer and closer to the + terminal of the circuit
Answer: AC
Resistance of a wire increases with increasing length and (to a smaller extent) with increasing temperature. Increasing wire length increases the number of atom-charge collisions and thus the amount of resistance. Increasing the temperature increases the resistivity of the textile and thus increases the overall resistance.
45. When plugged into a 120-Volt outlet, a light bulb consumes 300 joules of energy over a v 2nd fourth dimension menstruum. The power of the low-cal bulb is ____ Watts.
a. 0.0167
b. 0.fifty
c. 2.0
d. two.l
eastward. sixty
f. 600
k. 1500
h. 7200
Respond: Due east
Power is simply the rate at which energy is supplied to a circuit or transformed past a circuit. In this example, the power is the energy consumed per time.
46. A sure electrical circuit contains a battery, wires and a light bulb. If potential energy is gained by charges at the battery location, and then charges lose potential energy ____.
a. in the wires onlyb. in the bulb but
c. every bit in the wires and the bulb
d. more often than not in the wires simply a little in the bulb
eastward. mostly in the bulb but a little in the wires
f. nowhere
Reply: E
Accuse will lose energy equally they pass through locations of resistance. When in series, locations of greatest resistance will transform electrical energy into other forms at a greater rate. So free energy volition exist lost in the lite bulb and in the wires to a much lesser extent.
47. A high resistance light seedling and a depression resistance light bulb are connected in serial to a 6-Volt pack of batteries. Which of the 2 calorie-free bulbs will shine the brightest?
a. They will have the same brightness.b. The low-R bulb will shine more than brightly.
c. The high-R bulb will shine more brightly.
d. There is no way to make such a prediction since bulb brightness is contained of bulb resistance.
Respond: C
Since the two light bulbs are in series, the same current (i) is experienced by each. The power will be given by the itwo•R product. Since i is the same for each light bulb, the bulb with the greatest resistance will have the greatest power. So the high-R light bulb volition transform electrical energy into lite energy at the greatest rate and thus shine most brightly.
48. A high resistance light bulb and a low resistance low-cal seedling are continued in parallel and powered past a 6-Volt pack of batteries. Which of the two light bulbs will shine the brightest?
a. They will have the same brightness.b. The depression-R bulb will shine more brightly.
c. The loftier-R bulb volition shine more brightly.
d. There is no way to make such a prediction since bulb effulgence is indepenent of bulb resistance.
Answer: B
Since the two lite bulbs are in parallel, the same voltage drop (Five) is experienced past each. The power volition be given by the itwo•R product. Since 5 is the same for each calorie-free seedling, the bulb with the greatest resistance volition have the lest current. Current is of the greatest importance in determining the power of the light bulb since it is squared in the equation. And then the low-R light bulb volition have the greatest current and thus transform electric energy into low-cal energy at the greatest rate; it will smoothen almost brightly.
a. increase the resistance of one of the bulbsb. increase the resistance of two of the bulbs
c. decrease the resistance of two of the bulbs
d. increase the voltage of the bombardment
east. decrease the voltage of the battery
f. remove one of the bulbs
Answer: CDF
The current in a serial circuit (both total current and electric current through individual resistors) is straight dependent upon the battery voltage and inversely dependent upon the full circuit resistance. This current can be increased past increasing the battery voltage. It can also be increased past decreasing the total resistance. Removing a bulb would subtract the total resistance and decreasing the resistance of any individual bulb would subtract the full resistance.
a. increase the resistance of one of the bulbsb. increment the resistance of two of the bulbs
c. subtract the resistance of ii of the bulbs
d. increase the voltage of the bombardment
due east. subtract the voltage of the bombardment
f. remove ane of the bulbs
Reply: CD
Point P represents the location where the full current of this parallel circuit can be measured. The total current would vary directly with the total voltage and inversely with the full resistance. Increasing the battery voltage would increase the current at location P. Decreasing the total resistance would increase the electric current at location P. The total resistance can exist decreased past adding another resistor in a carve up branch or by decreasing the resistance of any of the branches.
a. increase the resistance of bulb 10b. decrease the resistance of bulb Ten
c. increase the resistance of seedling Z
d. decrease the resistance of bulb Z
e. increment the voltage of the battery
f. decrease the voltage of the bombardment
thou. remove seedling Y
Answer: CF
The current in seedling Z is dependent upon the voltage driblet across bulb Z and the resistance of bulb Z. In equation grade,
An increase in battery voltage would increment the voltage drib across bulb Z (VZ) and thus provide a greater current through the bulb. A decrease in the resistance of bulb Z would also increase the electric current through the bulb. However, making a alter in seedling Ten or Y would take no effect on the 5Z / RZ ratio.
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