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WorksheetsElectricity & Magnetism Review
Total questions: 44
Worksheet time: 24mins
Name
Class
Date
1.
If the two charges represented in the figure were brought near each other, they would
a)
attract each other.
b)
repel each other.
c)
cause static discharge.
d)
have no affect on each other
2.
If a neutral metal comb is held near an object with a negative charge, the comb will become charged by
a)
friction.
b)
induction.
c)
contact.
d)
static discharge.
3.
What is the difference in electrical potential energy between two places in an electric field?
a)
resistance
b)
current
c)
voltage
d)
power
4.
The current in a hair dryer measures 15.0 amps. The resistance of the dryer is 8 ohms. At what voltage does this dryer operate? V = IR, P = IV
a)
1.875 V
b)
110 V
c)
115 V
d)
120 V
5.
What is the unit of electrical power?
a)
watt
b)
volt
c)
ampere
d)
ohm
6.
The force a magnet exerts on another magnet, on iron or a similar metal, or on moving charges is
a)
an electric force.
b)
a magnetic force.
c)
proportional to the charge of the object.
d)
proportional to the size of the magnet.
7.
In the Figure, starting from the left what magnetic poles are shown on the two bar magnets?
a)
south, south, north, north
b)
south, north, south, north
c)
north, south, north, south
d)
north, north, south, south
8.
What is the name of the area surrounding Earth that is influenced by Earth’s magnetic field?
a)
atmosphere.
b)
aurora borealis
c)
stratosphere
d)
magnetosphere.
9.
Which of the following statements is true about Earth’s magnetic poles?
a)
They are the areas where Earth’s magnetic field is strongest.
b)
They are located at Earth’s geographic poles.
c)
They are the areas where Earth’s magnetic field is weakest.
d)
Earth has four magnetic poles.
10.
If you cut a bar magnet in half, each half
a)
becomes unmagnetized.
b)
becomes a bar magnet with two poles.
c)
contains one magnetic pole.
d)
is only temporarily magnetized.
11.
How can a permanent magnet be demagnetized?
a)
Cut the magnet in half.
b)
Strike the magnet with a heavy blow.
c)
Heat the magnet up.
d)
both b and c
12.
Which of the following is the reason “soft” iron is used for the cores of electromagnets?
a)
It is difficult to magnetize.
b)
It is easily magnetized.
c)
It has no magnetic domains.
d)
It is a permanent magnet.
13.
How are fossil fuels used to generate electrical energy?
a)
Heat from burning fuel creates steam that turns a transformer.
b)
Heat from burning fuel causes an electric motor to produce a current.
c)
Heat from burning fuel spins magnets inside an electric motor.
d)
Heat from burning fuel creates steam that spins a turbine.
14.
Walking across a carpet is an example of charge being transferred by
a)
friction.
b)
induction.
c)
contact.
d)
static electricity
15.
What type of current is produced by a battery?
a)
series current (SC)
b)
potential current (PC)
c)
direct current (DC)
d)
alternating current (AC)
16.
The type of current in your school is mostly
a)
alternating current (AC)
b)
direct current (DC)
c)
potential current (PC)
d)
series current (SC)
17.
Which of the following materials allows charges to flow easily?
a)
wood
b)
an electrical insulator
c)
glass
d)
an electrical conductor
18.
Resistance is affected by a material’s
a)
temperature.
b)
thickness.
c)
length.
d)
all of these.
19.
Which of the following would reduce the resistance of a metal wire?
a)
increase the thickness
b)
increase the length
c)
decrease the temperature
d)
all of these
20.
If you know the power rating of an appliance and the voltage of the line it is attached to, you can calculate the current the appliance uses by
a)
multiplying the voltage by the power.
b)
dividing the power by the voltage.
c)
dividing the voltage by the power.
d)
subtracting the power from the voltage.
21.
Which of the following provides electrical safety?
a)
fuses
b)
circuit breakers
c)
ground-fault interupters
d)
all of these
22.
Which of the following statements describes the interaction between magnetic poles?
a)
Like poles repel each other, and opposite poles attract each other.
b)
Like poles attract each other, and opposite poles repel each other.
c)
Opposite poles repel each other.
d)
Like poles attract each other.
23.
A ferromagnetic material that has domains that remain aligned for a long period of time is called
a)
a permanent magnet.
b)
a temporary magnet.
c)
a neutral object.
d)
nonmagnetic.
24.
How does the magnetic force exerted by a magnet change as the distance between two magnets increases?
a)
The magnetic force increases.
b)
The magnetic force decreases.
c)
The magnetic force does not change with distance.
d)
The magnetic force stays the same.
25.
Which creates a magnetic field?
a)
charged particles that do not move
b)
an isolated magnetic pole
c)
moving electric charges
d)
gravity
26.
Moving a magnet inside a coil of wire will induce a voltage in the coil. How can the voltage in the coil be increased?
a)
Move the magnet inside the coil of wire more slowly.
b)
Hold the magnet stationary.
c)
Move the coil of wire slowly, and keep the magnet stationary.
d)
Move the magnet inside the coil of wire more rapidly.
27.
The process of generating an electric current by moving an electrical conductor relative to a magnetic field is called
a)
alternating current.
b)
electromagnetic force.
c)
electromagnetic induction.
d)
magnetization.
28.
A device that changes mechanical energy to electrical energy by rotating a coil of wire through a magnetic field is called a(an)
a)
generator.
b)
transformer.
c)
electromagnet.
d)
current meter.
29.
Frictional and other contact forces are caused by
a)
Strong nuclear forces.
b)
Gravitational Forces.
c)
Electric forces.
d)
Magnetic forces.
30.
Circuits in homes are usually wired in
a)
series.
b)
parallel.
c)
aluminum wire.
d)
series with a fuse.
31.
In a van der Graff generator, electrons come from
a)
the rubber belt.
b)
the motor.
c)
the electric circuit.
d)
the earth.
32.
Static cling in clothes can easily be reduce with
a)
wiping with a cloth.
b)
wiping with aluminum foil.
c)
a spray of water.
d)
a spray of electrons.
33.
The 3rd prong on a power plug is the _____ wire.
a)
extra
b)
hot (live)
c)
return
d)
ground
34.
Electric “pressure” is called
a)
power.
b)
resistance.
c)
voltage.
d)
current.
35.
The number of electrons flowing is called _____.
a)
voltage.
b)
power.
c)
current.
d)
resistance.
36.
A photovoltaic cell converts _____ directly into electrical power.
a)
chemicals
b)
heat
c)
power
d)
light
37.
Which circuit is a series circuit?
a)
Circuit A
b)
Circuit B
c)
Both Circuits A and B
d)
Neither Circuits A nor B
38.
Which circuit will have the brightest bulbs when the switch is closed?
a)
Circuit A
b)
Circuit B
c)
Circuit C
d)
All will have the same brightness.
39.
If bulb “B” burns out, how does this affect the rest of the circuit?
a)
Bulb A will go out.
b)
Bulb C will go out.
c)
Bulbs E and F will go out.
d)
It has no affect.
40.
A 20-volt relay has a coil resistance of 200 ohms. How much current does it draw? V=IR, P=IV
a)
0.10 A
b)
10 A
c)
400 A
d)
4000 A
41.
If a small appliance is rated at a current of 10 amps and a voltage of 120 volts, the power rating would be ______ Watts. (V = IR, P = I V )
a)
12 W
b)
120 W
c)
1200 W
d)
0.083 A
42.
Tommy runs his juicer every morning. The juicer uses 90 W of Power and the current supplied is 4.5 A. How many volts are necessary to run the juicer?
a)
20 V
b)
405 V
c)
120 V
d)
240 V
43.
A DC electric motor transforms 2.50 kW of electrical power into mechanical form. If the motor's operating voltage is 300 volts, how much current does it "draw" when operating at full load (full power output)?
a)
750 A
b)
0.0083 A
c)
0.83 A
d)
8.3 A
44.
A Toyota Prius motor draws 35 amps of current. If the resistance in the electric motor is 8.3 ohms, what is the power output of the electric motor in a Toyota Prius?
a)
10.2 W
b)
290 W
c)
10.2 kW
d)
290 kW
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