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Chapter 7 – Electrodynamics

Total questions: 47

Worksheet time: 47mins

Name
Class
Date
1.

The rate at which electric charges flow is called:

a)

Voltage

b)

Current

c)

Resistance

d)

Capacitance

2.

Electrodynamics is primarily concerned with:

a)

Charges at rest

b)

Magnetic domains

c)

Charges in motion

d)

Electromagnetic radiation only

3.

The unit of electric potential difference is the:

a)

Ohm

b)

Coulomb

c)

Ampere

d)

Volt

4.

The resistance of a conductor is measured in:

a)

Watts

b)

Ohms

c)

Volts

d)

Henries

5.

What is the unit for electric current?

a)

Ampere

b)

Volt

c)

Ohm

d)

Watt

6.

According to Ohm’s law, current is directly proportional to:

a)

Voltage

b)

Resistance

c)

Power

d)

Charge

7.

Which equation correctly expresses Ohm’s law?

a)

P=IVP = IV

b)

V=IRV = IR

c)

E=mc2E = mc^2

d)

P=I2RP = I^2 R

8.

Which property of a conductor increases resistance?

a)

Greater cross-sectional area

b)

Lower temperature

c)

Longer length

d)

Shorter length

9.

A high-resistance conductor will produce ________ heat.

a)

No

b)

Less

c)

More

d)

The same amount of

10.

The opposition to electron flow in a circuit is:

a)

Voltage

b)

Conductance

c)

Resistance

d)

Inductance

11.

A material that strongly resists the flow of electrons is a(n):

a)

Conductor

b)

Semiconductor

c)

Insulator

d)

Alloy

12.

Which of the following is a conductor?

a)

Rubber

b)

Glass

c)

Copper

d)

Air

13.

Increasing the temperature of a conductor generally:

a)

Decreases resistance

b)

Increases resistance

c)

Leaves resistance unchanged

d)

Eliminates resistance

14.

Which device inhibits electrical current?

a)

Transformer

b)

Resistor

c)

Battery

d)

Capacitor

15.

A component that stores electric charge temporarily is the:

a)

Inductor

b)

Capacitor

c)

Diode

d)

Rheostat

16.

Power in an electric circuit is measured in:

a)

Joules

b)

Amperes

c)

Watts

d)

Volts

17.

The formula for electrical power is:

a)

P=V/RP = V/R

b)

P=I2RP = I^2 R

c)

P=R/IP = R/I

d)

P=V2/RP = V^2/R

18.

If voltage increases and resistance stays constant, current will:

a)

Decrease

b)

Increase

c)

Remain zero

d)

Oscillate randomly

19.

When electrons move through a conductor, they generate:

a)

A magnetic field

b)

Electrostatic charge only

c)

Nuclear radiation

d)

Sound waves only

20.

The unit of electrical charge is the:

a)

Tesla

b)

Coulomb

c)

Farad

d)

Weber

21.

Which of the following is an example of direct current (DC)?

a)

Wall outlet

b)

Battery

c)

Transformer output

d)

Radio broadcast

22.

Alternating current changes:

a)

Magnitude only

b)

Direction only

c)

Both direction and magnitude

d)

Neither direction nor magnitude

23.

Which of the following uses alternating current?

a)

Household outlets

b)

Flashlight battery

c)

Car battery terminals

d)

Solar panel output

24.

The number of times AC reverses direction per second is the:

a)

Period

b)

Frequency

c)

Amplitude

d)

Phase

25.

The U.S. electrical frequency standard is:

a)

50 Hz

b)

60 Hz

c)

100 Hz

d)

120 Hz

26.

Electrical power companies deliver:

a)

DC

b)

AC

c)

Pulsed DC

d)

Static electricity

27.

Electric circuits require:

a)

Only a source of voltage

b)

Only a conducting path

c)

A source, a closed conducting path, and a load

d)

Only a load

28.

The force that pushes electrons through a conductor is:

a)

Resistance

b)

Voltage

c)

Capacitance

d)

Inductance

29.

Water flowing through a pipe is often compared to:

a)

Voltage

b)

Power

c)

Current

d)

Resistance

30.

In a series circuit, if one component fails, current will:

a)

Increase in the remaining components

b)

Bypass the failed component

c)

Stop

d)

Divide among the remaining components

31.

In a parallel circuit, if one branch opens, the remaining branches:

a)

Stop conducting

b)

Continue functioning

c)

Short to ground

d)

Double in voltage

32.

A ground is used to:

a)

Increase circuit voltage

b)

Provide a safe path for fault current to earth

c)

Eliminate all resistance

d)

Store excess electrons for later use

33.

Electrons flow because of:

a)

Thermal gradient

b)

Electrical potential difference

c)

Magnetic flux

d)

Mechanical pressure

34.

Which of the following increases current?

a)

Decreased voltage

b)

Increased voltage

c)

Increased resistance

d)

An open circuit

35.

Copper is often used in wiring because it:

a)

Has low resistivity

b)

Is magnetic

c)

Has high resistivity

d)

Is a good insulator

36.

Electrical work done is measured in:

a)

Newtons

b)

Joules

c)

Amperes

d)

Ohms

37.

A transformer operates on:

a)

AC only

b)

DC only

c)

Both AC and DC equally

d)

Static electric fields only

38.

Electrons flowing in only one direction describes:

a)

AC

b)

DC

c)

Electromagnetic radiation

d)

Ground fault

39.

The product of current and resistance gives:

a)

Voltage

b)

Power

c)

Charge

d)

Inductance

40.

What is the definition of electrical current?

a)

The opposition to the flow of electrons

b)

The rate of flow of charge

c)

The work done on each coulomb of charge

d)

Electrons moving around

41.

A conductor has _____ resistance. An insulator has ______ resistance.

a)

Low; high.

b)

Negative; positive.

c)

Positive, negative.

d)

High, low.

42.

Resistance is

a)

Measured using an ammeter

b)

Units are 'volts'

c)

How difficult it is for electrons to move through an object

d)

The continuous movement of electrons in a wire

43.

An electric current is

a)

A continuous flow of electric charge

b)

An irregular flow of electric charge

c)

Only found using insulators

d)

Just wires connected to a magnet

44.

Resistance is ___________________.

a)

The build up of electrical charges in one place

b)

how much a material opposes, or resists, the flow of electric current

c)

a conductor

d)

when the electric current can flow freely through a circuit

45.

A circuit has a 24V battery and the resistor is 8Ω. How many amps are running through the circuit?

a)

3A

b)

192A

c)

2A

d)

4A

46.

What will happen when you remove a bulb from the circuit pictured?

a)

The other bulb will become brighter.

b)

The other bulb will turn off.

c)

The other bulb will become dimmer.

d)

It will remain a closed circuit.

47.

An electric current can move along more than one path in a.....

a)

Series circuit

b)

Parallel circuit

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