How can you test to see if there is a current running through a wire?

place several compasses around the wire

listen carefully to see if you hear a buzzing sound

place several batteries around the wire

An electromagnet is a magnet that

its strength can be varied and turned on and off

always has a magnetic field around it

What THREE ways are electromagnets different from permanent magnets?

they can increase in strength by increasing the current in the wire

they can change which is the north and south pole

Electromagnets are useful in industry such as a junk yard because they

have strong north and south poles

Permanent Magnets and Electromagnets are similar in which TWO ways?

they both have a north and south pole

they are surrounded by a magnetic field

What is one difference between electromagnets and bar magnets?

Electromagnets need electricity but bar magnets do not

Bar magnets can be turned off but electromagnets cannot

Bar magnets have a magnetic field but electromagnets do not

Bar magnets are bigger than electromagnets

How can you reverse a magnetic field in a circuit?

Connect the battery the other way around

Which of the following is a complete energy transformation for a flashlight? (Assume kinetic thermal in all transformations)

Chemical energy > electrical energy > light energy

Mechanical energy > electrical energy > light energy

Chemical energy > electrical energy

Which of the following represents a complete energy transformation for a ceiling fan? (Assume thermal kinetic occurs in all transformations.)

Electrical kinetic energy > motion kinetic energy

Electrical kinetic energy > chemical potential energy

Mechanical energy > motion kinetic energy

Chemical potential energy > electrical kinetic energy

Which statement best describes an insulator?

A material that does not allow heat to flow through it

A material that allows electricity to flow through it

A material that does not allow liquids to flow through it

A material that cools down quickly when heated

What is the purpose of a simple electric motor?

To convert electrical energy to kinetic energy

To turn mechanical energy to electrical energy

What is the function of a switch in an electric circuit?

To allow electrons to flow through the circuit

To allow heat to flow through the circuit

To allow chemicals to flow through the circuit

Which is an advantage of a parallel circuit over a series circuit?

If one bulb goes out, the other stays lit.

The bulbs get dimmer as you add more.

If one bulb goes out, all go out.

How are electromagnets different from magnets?

you can turn an electromagnet on/off

magnets have a North and South pole

a force that either attracts or repels certain materials

invisible objects coming together

How do you make an electromagnet stronger?

add more wire coils and/or batteries

Add more light bulbs and/or wire coils

add more wire coils and/or a switch

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

Add more coils of wire to the nail.

Reverse the poles of the magnet.

Remove all the coils and the nail.

Electromagnets

Authored by Glynnan Barham

Science

4th - 8th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

15 mins • 1 pt

A magnetic field is a force field created by

gravity

force

magnets

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Arrows are close together on a force field when the force is

stronger

weaker

opposite

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

A compass needle shows us the magnetic field of

the sun

Earth

the moon

a magnet that is near by

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Earth has a magnetic field that is similar to a bar magnet's magnetic field.

true

false

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Earth's magnetic South Pole is near Earth's geographic North Pole

true

false

Tags

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Electronic devices create magnetic fields because they

are magnets

are compasses

have moving particles with electric charge

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

A compass needle points north because of Earth's magnetic field unless

it is close to a wire with a current

it is close to any wire

it is close to a battery

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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Electromagnets

A magnetic field is a force field created by

Arrows are close together on a force field when the force is

A compass needle shows us the magnetic field of

Earth has a magnetic field that is similar to a bar magnet's magnetic field.

Earth's magnetic South Pole is near Earth's geographic North Pole

Electronic devices create magnetic fields because they

A compass needle points north because of Earth's magnetic field unless

How can you test to see if there is a current running through a wire?

The compass needles are turned by magnetic forces caused by electric current. The magnetic forces caused by an electric current are one kind of

The electromagnetic forces from a current carrying wire are strong enough to move the compass needle. The forces can be made stronger by

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