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Electromagnetism Review

Total questions: 15

Worksheet time: 15mins

Name
Class
Date
1.

Choose all of the generators

a)
b)
c)
d)
e)
2.

Choose all of the motors.

a)
b)
c)
d)
e)
3.

Choose all of the transformers.

a)
b)
c)
d)
e)
4.

How does a motor work?

a)

Current generates an electric field around the loop of wire. The electric force causes the loop of wire to rotate.

b)

Current generates a magnetic field in the loop of wire that is then attracted and repelled by the magnet(s) in the motor.

c)

The magnets in the motor attract and repel the metal in the copper wire that makes up the loop. This causes the loop to rotate.

5.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
6.
This picture is an example of a ___________
a)
Step- Up Transformer
b)
Step- Down Transformer
c)
Motor
d)
Generator
7.

Motors are devices that convert _____ energy into _____ energy.

a)

chemical; mechanical

b)

mechanical; electrical

c)

electrical; mechanical

d)

potential; kinetic

8.

A transformer actually transforms

a)

voltage

b)

magnetic field lines

c)

generators into motors

9.

How can you increase the magnetic field strength in an electromagnet?

a)

Increase the number of coils.

b)

increase the voltage

c)

increase the current by reducing the resistance of the coil

d)

all of the above

10.

How can you decrease the magnetic field strength in an electromagnet?

a)

Increase the number of coils.

b)

increase the voltage

c)

decrease the current by increasing the resistance of the coil

d)

all of the above

11.

What did Faraday discover about Induction?

a)

That a changing magnetic field induces a current in a conductor.

b)

That electricity and magnetism were related when he noticed a current carrying conductor deflected the compass of a needle.

c)

That the Earth's magnetosphere deflected charged particles from the sun known as solar winds.

d)

That alternating current could be manipulated with transformers.

12.

What did Oersted discover about Induction?

a)

That a changing magnetic field induces a current in a conductor.

b)

That electricity and magnetism were related when he noticed a current carrying conductor deflected the compass of a needle.

c)

That the Earth's magnetosphere deflected charged particles from the sun known as solar winds.

d)

That alternating current could be manipulated with transformers.

13.

If you brought an unknown pole of a magnet near a North magnetic pole and they repel what is the unknown pole?

a)

North

b)

South

c)

Neutral

d)

not enough information

14.

If you brought an unknown pole of a magnet near a South magnetic pole and they attract what is the unknown pole?

a)

North

b)

South

c)

Neutral

d)

not enough information

15.

What do we know about Earth's Magnetic Field?

a)

It is likely caused my the molten iron core of the Earth.

b)

It protects us from solar winds.

c)

It causes the auroras.

d)

It does not deflect particles that move parallel to the field lines.

e)

all of the above.