AP PHYSICS C: ELECTRIC CIRCUITS Practice Test

1. Question

Given: R1=5Ω ,R2=7Ω What is the total resistance of the circuit above?

6.0 Ω
12 Ω
35 Ω
2.92 Ω
0.35 Ω

2. Question

You have 3 resistors in parallel with each other. What can you say for certain about the total resistance of the circuit?

The total resistance is higher than any individual resistor.
The total resistance is less than any individual resistor.
Nothing can be said for certain about the total resistance.
The total resistance is equal to the arithmetic mean of the resistors.
The total resistance is somwhere between the highest resistor and the lowest resistor.

3. Question

You have two resistors in series, with the pair being in parallel with another resistor. What can be said for certain about the total resistance?

The total resistance is somewhere in between the highest resistor and the lowest resistor (inclusive).
The total resistance is lower than any individual resistor.
The total resistance is the arithmetic mean of the resistors.
The total resistance is higher than any individual resistor
None of the answers are certain.

4. Question

A circuit has two identical resistors in series. The resistors are then changed so they are in parallel. How will the current of the circuit change?

It will be a quarter of its original value.
None of these.
It will double.
It will be cut in half.
It will be quadrupled.

5. Question

A 10 Ω, 15 Ω, and 40 Ω resistor are connected as shown to a 48-Volt emf source with internal resistamce r=1 Ω. What is the terminal voltage of the emf source?

48v
47v
46v
43v
0v

6. Question

Two 10 Ω resistors and a 40 Ω resistor are connected as shown to a 100-Volt emf source with internal resistance r=2 Ω. How much Power is dissipated by the 40 Ω resistor?

160 W
40 W
400 W
5 W
500 W

7. Question

Which is the right form of Ohm’s Law?

V = I/R
V = R/I
I = V/R
I = R/V
R = I/V

8. Question

Resistors are one of the most important basic components of a circuit. With very few exceptions, all circuits have at least one kind of resistor component. An ammeter is a device that measures current flowing through a circuit. Ammeters are always connected to a circuit in series.
Which of the following accurately explains why ammeters must be connected in series within a circuit, and never in parallel?

An ammeter connected in parallel would give the current flowing through the circuit a pathway with minimal resistance, creating a very large current that could harm the ammeter
An ammeter connected in parallel would give high readings of current because the current would be flowing through both the regular current path and the ammeter, but disproportionately through the ammeter
An ammeter connected in parallel would not read any current because the current would have no driving force through the ammeter
An ammeter connected in parallel would give very low readings of current because current would be flowing through both the regular current path and the ammeter, but disproportionately through the regular path

9. Question

Three resistors and a battery form the following circuit. Calculate the equivalent resistance if the resistors have the following values. R1=40Ω, R2=25Ω, R3=38Ω

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10. Question

A lamp has a 60W bulb. If the house wiring provides 110V to light up that bulb, how much current does the bulb draw?

5.83 A
0.55 A
0.72 A
1.37 A
0.03 A

11. Question

A straight copper wire has a fixed voltage applied across its length. Which of the following changes would increase the power dissipated by this wire?

None of these options result in increased power dissipation
Decreasing the length of the wire
Changing the material of the wire to a metal of greater resistivity
Decreasing the cross-sectional area of the wire
ncreasing the temperature of the wire

12. Question

A battery is measured to have a potential of 5V. When connected to a wire with no resistors or other components, the voltage measured is 4.9V. If the current through the wire is measured to be 2A, how much thermal energy is being lost per second as soon as the wire is connected to the battery?

0W
0.4W
1.0W
0.2W
0.8W

13. Question

Three capacitors are connected to a battery as shown and allowed to charge fully. What is the equivalent capacitance of the three capacitors?

5μF
68μF
50μF
680μF
340μF

14. Question

Given R 1 =15Ω, R 2 =20Ω, R 3 =20Ω, V=50V What is the current delivered to the curcuit by the battery?

2.0 A
4.6 A
1.1 A
0.91 A
3.6 A

15. Question

A simple circuit contains two 12Ω resistors in parallel, connected to a 20V source. What power is being provided by the source to the circuit?

67W
20W
56W
42W
49W

16. Question

A battery is measured to have a potential of 5V. When connected to a wire with no resistors or other components, the voltage measured is 4.9V. Why was the potential of the battery measured differently when the wire was connected?

The difference in potential measured is small enough to be disregarded
The wire connected to the battery must be connected to something else where this potential is being lost
The wire has a slight internal resistance and caused a potential drop
Once the current is distributed across the wire, there is less charge per unit length of the circuit and so the voltage is lower
The wire is causing electrons to be lost to the air, which lowers the potential measured

17. Question

A simple circuit consists of a 2 MΩ resistor that’s connected to a 9V battery. How much power is dissipated by the resistor?

18. Question

A cicuit with a voltage source of 40V has a 15Ω resistor and a 5Ω resistor in series, followed by two 5Ω resistors in parallel. After the parallel branches rejoin, there is a 10Ω resistor before the circuit is closed at the voltage source.What is the current supplied by the source?

1.5 A
1.0 A
1.2 A
0.82 A
0.96 A

19. Question

It is an electromotive force or potential difference that will cause current to flow.

Resistivity
Ammeter
Voltage
Capacitor

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AP PHYSICS C: ELECTRIC CIRCUITS Practice Test

AP PHYSICS C: ELECTRIC CIRCUITS Practice Test

AP PHYSICS C: ELECTRIC CIRCUITS Practice Test

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1. Question

Given: R1=5Ω ,R2=7Ω What is the total resistance of the circuit above?

2. Question

You have 3 resistors in parallel with each other. What can you say for certain about the total resistance of the circuit?

3. Question

You have two resistors in series, with the pair being in parallel with another resistor. What can be said for certain about the total resistance?

4. Question

A circuit has two identical resistors in series. The resistors are then changed so they are in parallel. How will the current of the circuit change?

5. Question

A 10 Ω, 15 Ω, and 40 Ω resistor are connected as shown to a 48-Volt emf source with internal resistamce r=1 Ω. What is the terminal voltage of the emf source?

6. Question

Two 10 Ω resistors and a 40 Ω resistor are connected as shown to a 100-Volt emf source with internal resistance r=2 Ω. How much Power is dissipated by the 40 Ω resistor?

7. Question

Which is the right form of Ohm’s Law?

8. Question

9. Question

Three resistors and a battery form the following circuit. Calculate the equivalent resistance if the resistors have the following values. R1=40Ω, R2=25Ω, R3=38Ω

10. Question

A lamp has a 60W bulb. If the house wiring provides 110V to light up that bulb, how much current does the bulb draw?

11. Question

A straight copper wire has a fixed voltage applied across its length. Which of the following changes would increase the power dissipated by this wire?

12. Question

A battery is measured to have a potential of 5V. When connected to a wire with no resistors or other components, the voltage measured is 4.9V. If the current through the wire is measured to be 2A, how much thermal energy is being lost per second as soon as the wire is connected to the battery?

13. Question

Three capacitors are connected to a battery as shown and allowed to charge fully. What is the equivalent capacitance of the three capacitors?

14. Question

Given R 1 =15Ω, R 2 =20Ω, R 3 =20Ω, V=50V What is the current delivered to the curcuit by the battery?

15. Question

A simple circuit contains two 12Ω resistors in parallel, connected to a 20V source. What power is being provided by the source to the circuit?

16. Question

A battery is measured to have a potential of 5V. When connected to a wire with no resistors or other components, the voltage measured is 4.9V. Why was the potential of the battery measured differently when the wire was connected?

17. Question

A simple circuit consists of a 2 MΩ resistor that’s connected to a 9V battery. How much power is dissipated by the resistor?

18. Question

A cicuit with a voltage source of 40V has a 15Ω resistor and a 5Ω resistor in series, followed by two 5Ω resistors in parallel. After the parallel branches rejoin, there is a 10Ω resistor before the circuit is closed at the voltage source.What is the current supplied by the source?

19. Question

It is an electromotive force or potential difference that will cause current to flow.