Electromagnets, Generators and Motors

1.

Multiple Choice

1 min

1 pt

What is the transfer of electricity in a motor?

chemical to mechanical

electrical to mechanical

mechanical to electrical

physical to potential

2.

Multiple Choice

45 sec

1 pt

What is the transfer of electricity in a generator?

Mechanical to Electrical

Physical to Potential

Electrical to Mechanical

Yogurt to Light

3.

Multiple Choice

45 sec

1 pt

What can you use to make an electromagnet?

Battery, nail and string

Battery, pencil and wire

Wire, battery and iron ore (nail)

Peanut butter, lampshade, hand sanitizer

4.

Multiple Choice

45 sec

1 pt

In large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.

Wind

Water

Magnets

Circuits

5.

Multiple Choice

45 sec

1 pt

Which device uses mechanical energy to produce electrical energy?

Electric Motor

Magnet

Generator

Solar Cell

6.

Multiple Choice

30 sec

1 pt

Electric fields are often associated with what other kind of field?

Magnetic Fields

Nuclear Fields

Particle Fields

Corn Fields

7.

Multiple Choice

1 min

1 pt

What device is made of coils of wire with an electrical current passing through it in order to generate a magnetic field?

Electromagnet

Generator

Electron Magnet

Motor

8.

Multiple Choice

45 sec

1 pt

What force does a magnetic field apply without actually touching the object?

a push or pull

gravity

friction

pressure

9.

Multiple Choice

1 min

1 pt

What two forces are required for generators and electric motors to work?

magnetism and thermal

electricity and thermal

electricity and magnetism

magnetism and radiant

10.

Multiple Choice

2 mins

1 pt

What is the fan that turns the magnet inside a generator called?

electromagnet

turbine

solar panel

pinstock

11.

Multiple Choice

1 min

1 pt

What energy do you put IN to a generator?

Mechanical

Electrical

Thermal

Potential

12.

Multiple Choice

1 min

1 pt

What type of energy comes OUT of a generator?

Mechanical

Electrical

Thermal

Potential

13.

Multiple Choice

45 sec

1 pt

What happens to the strength of an electromagnet as you add more coils around it?

Increases

Decreases

Stays the same

Stops completely

14.

Multiple Choice

1 min

1 pt

In an electric motor, the energy transformation begins as ----

electrical and becomes chemical

mechanical and becomes electrical

electrical and becomes mechanical

mechanical and becomes chemical

15.

Multiple Choice

45 sec

1 pt

What is the device seen here?

generator

electric motor

electromagnet

magnet

16.

Multiple Choice

2 mins

1 pt

Which of the following is NOT part of an electromagnet?

Wire

Iron

Toothpick

Power source

17.

Multiple Choice

45 sec

1 pt

When two magnets attract, they ______________

push apart

change color

get colder

pull together

18.

Multiple Choice

45 sec

1 pt

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

Add more coils of wire to the nail.

Use a smaller battery.

Reverse the poles of the magnet.

Remove all the coils and the nail.

19.

Multiple Choice

45 sec

1 pt

Surrounding every magnet is a __________ __________.

magnetic field

electrical current

another magnet

an enemy

20.

Multiple Choice

45 sec

1 pt

If I were to try to connect the north pole of one magnet to the north pole of another magnet, the two poles would:

attract

repel

neither

flip

21.

Multiple Choice

45 sec

1 pt

If I were to try to connect the north pole of one magnet to the south pole of another magnet, the two poles would:

attract

repel

neither

flip

22.

Multiple Choice

1 min

1 pt

In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.

wire, iron, electric

electric, wire, iron

iron, electric, wire

excited, hair, apple

23.

Multiple Choice

45 sec

1 pt

While electric current is flowing through a wire, what surrounds the wire?

a magnetic field

a glowing light

neutrons

protons

24.

Multiple Choice

45 sec

1 pt

What is the flow of electrical charges called?

Voltage

Resistance

Current/electricity

Circuit

25.

Multiple Choice

2 mins

1 pt

Electricity is the flow of _________.

Protons

Neutrons

Electrons

26.

Multiple Choice

2 mins

1 pt

Which subatomic particle has a negative charge?

Proton

Neutron

Electron

Enlighton

27.

Multiple Choice

2 mins

1 pt

What will happen when these magnets are brought close together?

They will attract each other.

They will repel each other.

Both magnets will turn to the left

Both magnets will turn to the right

28.

Multiple Choice

45 sec

1 pt

What does a motor do?

Moves up and down

Rotates without electricity

It does

Uses electricity to rotate

29.

Multiple Choice

45 sec

1 pt

What is most likely to happen when the switch is closed?

A magnetic field should be produced

The nail will rust

The battery will explode

The wire will catch on fire

30.

Multiple Choice

45 sec

1 pt

How are electromagnets different from magnets?

magnets can be turned on/off

you can turn an electromagnet on/off

magnets are more powerful

magnets have a North and South pole

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