Name:    Quiz: Chapter 34 (Current Electricity)

Multiple Choice
Identify the choice that best completes the statement or answers the question.

1

When a 15-V battery is connected to a resistor, 2 A of current flows in the resistor. What is the resistor's value?
 a. 30 ohms b. 2 ohms c. 7.5 ohms d. 15 ohms e. more than 30 ohms

2

A light bulb is plugged into a 120-volt outlet and has a 0.3 A current in it. What is the power rating of the light bulb?
 a. 120 W b. 40 W c. 400 W d. 36 W e. 12 W

3

 a. alternating current and voltage. b. alternating the direction of voltage of the power source. c. huge chemical batteries. d. none of the above

4

The frequency of AC current in North America is
 a. 60 hertz. b. 50 hertz. c. 30 V. d. 120 V.

5

Current from a battery is always
 a. DC. b. AC.

6

What is the SI unit for electrical potential energy?
 a. volts b. coulombs c. watts d. joules

7

Electric power is defined as
 a. current times resistance. b. resistance times voltage. c. current times voltage. d. voltage divided by current. e. current divided by voltage.

8

What affect would tripling the resistance in a circuit have on the current.
 a. decrease it by a factor of six c. increase it by a factor of three b. decrease it by a factor of three d. increase it by a factor of six

9

How much power is used by a 6.0-V flashlight battery that draws 1.5 A of current?
 a. 30 W b. 6 W c. 4 W d. 1.5 W e. 9 W

10

In order for there to be a flow of charge from one place to another, there must be a
 a. conductor, such as a wire, connecting the two places. b. potential difference between the two places. c. Both A and B above

11

A 60-W light bulb and a 100-W light bulb are each connected to a 120-V outlet. Which light bulb has more current in it?
 a. the 100-W bulb. b. The same amount of current flows in both. c. the 60-W bulb.

12

Any path along which electrons can flow is called a __________.
 a. potentiometer c. electrical pathway b. electrical circuit d. wire

13

Electric potential is defined as
 a. electrical potential energy. b. electrical potential energy of a charge divided by the quantity of the charge. c. voltage. d. electrical potential energy of a charge multiplied by the quantity of the charge. e. gravitational potential.

14

If you plug an electric toaster rated at 110 V into a 220-V outlet, current in the toaster will be
 a. the same as if it were plugged into 110 V. b. more than twice what it should be. c. twice what it should be. d. half what it should be. e. none of the above

15

An ampere is a
 a. unit of current. b. current. c. type of charge. d. voltage. e. unit of resistance.

16

While you are standing on the ground in your running shoes, the greatest resistance between you and the ground is in
 a. the running shoes. b. the clothes you are wearing. c. your skin. d. your muscles. e. your legs.

17

When connected to a 110-volt power supply, how much current is in a light bulb that has a resistance of 330 ohms?
 a. 330 A b. 0.3 A c. 110 A d. 36,300 A e. 3.0 A

18

Power outlets in our homes typically have a potential difference of
 a. 240 V. b. 120 A. c. 30 V. d. 60 A. e. 120 V.

19

For most conductors, as their temperature increases, their resistance
 a. increases. b. decreases. c. stays the same.

20

A 10-ohm resistor has a 3-A current in it. What is the voltage across the resistor?
 a. 3 V b. 18 V c. 13 V d. 10 V e. more than 18 V

21

A 20-ohm resistor has a 5-A current in it. What is the voltage across the resistor?
 a. 5 V b. 20 V c. 30 V d. 25 V e. more than 30 V

22

The current through a 5-ohm resistor connected to a 150-V power supply is
 a. 10 A. b. 30 A. c. 150 A. d. 1A. e. none of the above

23

When a 10-V battery is connected to a resistor, 2 A of current flows in the resistor. What is the resistor's value?
 a. 20 ohms b. 5 ohms c. 2 ohms d. 10 ohms e. more than 20 ohms

24

Touching a charged body to earth to eliminate excess charge is called __________.
 a. charging c. equalizing b. grounding d. static equilibrium

25

In circuits of metal wires, _____________ are the flowing charged particles.
 a. electrons c. neutrons b. protons d. protons or electrons

26

What affect would tripling the voltage in a circuit have on the current.
 a. decrease it by a third c. triple it b. increase it by a factor of 6 d. no effect

27

When an 8-V battery is connected to a resistor, 2 A of current flows in the resistor. What is the resistor's value?
 a. 4 ohms b. 8 ohms c. 2 ohms d. 16 ohms e. more than 16 ohms

28

Electrical resistance in a wire depends on the wire's
 a. thickness. b. length. c. conductivity. d. all of the above e. none of the above

29

Compared to thin wires, electrical resistance in thick wires is
 a. less. b. the same. c. greater.

30

When plugged into a 120-V wall outlet, how much current is used by a lightbulb rated at 100 W?
 a. 100 A b. 0.8 A c. 12,000 A d. 120 A e. none of the above

31

If you accidentally grabbed the prongs of a partially plugged-in 120-V electrical plug on a day when your skin resistance was 140,000 ohms, how much current would pass through your body?
 a. 1,167 A b. 16,800,000 A c. 140,000 A d. 120 A e. 0.0009 A

32

Materials through which charges do not move easily.  (e.g. glass, dry wood, most plastics, cloth, and dry air) are called _____________.
 a. insulators c. ionic compounds b. circuits d. conductors

33

Electrical resistance is measured in
 a. watts. b. amperes. c. joules. d. volts. e. none of the above

34

In solid conductors, electric current is the flow of
 a. protons. b. negative ions. c. positive and negative charges. d. electrons. e. none of the above

35

An example of a voltage source is
 a. a car battery. b. a generator. c. a dry cell. d. rubbing a rubber rod with fur. e. all of the above

36

Materials that allow charges to move about easily (e.g. metals, plasma (ionized gas), graphite) are called _____________.
 a. circuits c. conductors b. insulators d. ionic compounds

37

What is the SI unit for charge?
 a. volt b. watt c. coulomb d. joule

38

The  rate at which energy is       transferred is called ____________.
 a. work c. energy b. current d. power

39

What is the resistance of a toaster that uses 3 A of current when connected to a 120-volt power source?
 a. 360 ohms b. 120 ohms c. 40 ohms d. 3 ohms e. none of the above

40

A volt is a unit of
 a. charge. b. current. c. electric potential. d. work. e. energy.