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Electromagnetism Review

Total questions: 24

Worksheet time: 18mins

Name
Class
Date
1.
As electrons move, they make
a)
A. electromagnetism.
b)
B. auroras.
c)
C. ferromagnetism.
d)
D. magnetic fields.
2.
A device that converts electrical energy into mechanical energy
a)
A. electromagnet
b)
B. electromagnetic induction
c)
C. electric motor
d)
D. electromagnetism
3.
A device that converts mechanical energy into electrical energy
a)
A. electric generator
b)
B. electric motor
c)
C. electromagnetic induction
d)
D. electric generator
4.
The process of creating a current in a circuit by changing a magnetic field
a)
A. electric generator
b)
B. electric motor
c)
C. electromagnetic induction
d)
D. magnet
5.
What is created when a magnet moves through a coil of wire?
a)
A. an electromagnet
b)
B. a ferromagnet
c)
C. a solenoid
d)
D. an electric current
6.
What kind of magnet can be turned on and off?
a)
refrigerator magnet
b)
electromagnet
c)
magnetite
d)
iron
7.
If you wrap more coils around an electromagnet, it will become 
a)
brighter
b)
stronger
c)
weaker
d)
invisible
8.
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
a)
Add more coils of wire to the nail.
b)
Use a smaller battery.
c)
Reverse the poles of the magnet.
d)
Remove all the coils and the nail.
9.

What happens when an electric current flows through a wire?

a)

The wire begins to spin.

b)

Nothing happens.

c)

A field of gravity is created around the wire.

d)

A magnetic field is created around the wire.

10.

What type of core is best for electromagnets?

a)

Steel

b)

Iron

c)

Plastic

d)

Copper

11.

What conclusion can you draw from this graph?

a)

As current increases, magnetic strength decreases.

b)

As current increases, magnetic strength increases.

c)

As current decreases, magnetic strength increases.

d)

There is no relationship between current and magnetic strength.

12.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
13.

What can you do to make electromagnets stronger?

a)

Increase number of coils of wire.

b)

Increase number of batteries used.

c)

Both A and B.

d)

Neither A nor B.

14.
Electric motors are devices that convert _____ energy into  _____ energy.
a)
electrical; mechanical
b)
mechanical; electrical
c)
chemical; potential
d)
mechanical; kinetic
15.
When John plugs in a toy and turns it on, a marble is carried up to the top of a slide. At the top, a marble is released and it goes down a slide. What kind of energy transformation occurs to make this toy work?
a)
chemical to heat
b)
electrical to chemical
c)
sound to electrical
d)
electrical to mechanical
16.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
17.

In a _______ a spinning turbine moves magnets which generates an electric current.

a)

Motor

b)

Generator

18.
What device is made of coils of wire with an electrical current passing through it in order to generate a magnetic field?  
a)
Electromagnet 
b)
Generator
c)
Electron Magnet 
d)
Motor
19.
What happens to the strength of an electromagnet as you add more coils around it?
a)
Increases
b)
Decreases
c)
Stays the same
d)
Stops completely
20.

What can you do to make electromagnets stronger?

a)

Increase number of coils of wire.

b)

Increase number of batteries used.

c)

Both A and B.

d)

Neither A nor B.

21.

What is produced by moving a permanent magnet through a coil of copper wire?

a)

electricity

b)

electromagnet

c)

light

d)

sound

22.
Electric motors are devices that convert _____ energy into  _____ energy.
a)
electrical; mechanical
b)
mechanical; electrical
c)
chemical; potential
d)
mechanical; kinetic
23.
When John plugs in a toy and turns it on, a marble is carried up to the top of a slide. At the top, a marble is released and it goes down a slide. What kind of energy transformation occurs to make this toy work?
a)
chemical to heat
b)
electrical to chemical
c)
sound to electrical
d)
electrical to mechanical
24.
In large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.
a)
Wind
b)
Water
c)
Magnets
d)
Circuits

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