# Using Electricity to Make a Magnet

In this worksheet, students will explain how to make an electromagnet, which is a magnet made using electricity. There is no magnetism if the electric current does not flow through the wire.

Key stage:  KS 3

Curriculum topic:   Physics: Electricity and Electromagnetism

Curriculum subtopic:   Magnetism

Difficulty level:

### QUESTION 1 of 10

An electromagnet is a magnet made using electricity. It is only magnetic when the electric current is flowing through the wire. Like all magnets, electromagnets have a N and a S pole, and their position depends on the direction of the flowing current. When an electric current flows through a wire, a magnetic field is created around the wire. The field is strengthened when the wire is twisted into a coil.

These diagrams show how an electromagnet is formed by coiling a wire and then how the direction of the magnetic field changes according to the direction in which the current is flowing (see arrows on wires).

An electromagnet is made by winding the wire into a coil around a metal bar and letting electricity flow through it. The magnetic field is present only when electricity flows through the wire. This is what makes electromagnets very useful.

There are several uses of electromagnets (medical, industrial and home uses):

• removing objects from people's eyes
• in cat-scanning (CATSCAN) devices
• in scrapyards to pick up objects made of steel
• in home circuit breakers, amplifiers and door bells
• telephones, loudspeakers, driving motors and PCs

Electromagnet separating steel items in a scrapyard

What do you use to make an electromagnet?

heat

kinetic energy

electricity

thermal energy

Is the following statement true or false?

An electromagnet does not have poles like the other magnets.

true

false

What is created around a wire when electricity flows through it?

How can you strengthen the magnetic field around a wire when electricity flows through it?

wind it into a coil

pull it apart

lengthen it

shorten it

What is the difference between an electromagnet and an ordinary magnet?

They have different sizes.

They have different names.

They do not have the same colour.

The electromagnet works only when electricity is on.

Is the following statement true or false?

Electromagnets are very useful because they are only magnetic when electricity flows through the wire.

true

false

Select THREE uses of electromagnets.

medical

cooking

industry

manufacture

Select TWO uses of electromagnets.

loudspeakers

washing machines

door bell

microwaves

Select TWO more uses of electromagnets.

amplifiers

junk yards

fields

school

Select the two medical uses of electromagnets:

removing objects from eyes

amplifiers

CAT scan equipment

loudspeakers

• Question 1

What do you use to make an electromagnet?

electricity
EDDIE SAYS
An electromagnet uses electricity, as its name suggests.
• Question 2

Is the following statement true or false?

An electromagnet does not have poles like the other magnets.

false
EDDIE SAYS
An electromagnet has poles, depending on the direction of the current.
• Question 3

What is created around a wire when electricity flows through it?

a magnetic field
magnetic field
EDDIE SAYS
When electricity flows through a wire there, is a weak magnetic field around the wire.
• Question 4

How can you strengthen the magnetic field around a wire when electricity flows through it?

wind it into a coil
EDDIE SAYS
Winding the wire into a coil strengthens the magnetic field.
• Question 5

What is the difference between an electromagnet and an ordinary magnet?

The electromagnet works only when electricity is on.
EDDIE SAYS
Electromagnets work only when electricity is on and this is what makes them useful.
• Question 6

Is the following statement true or false?

Electromagnets are very useful because they are only magnetic when electricity flows through the wire.

true
EDDIE SAYS
Electromagnets are useful because they are magnetic only when electricity flows through them.
• Question 7

Select THREE uses of electromagnets.

medical
industry
manufacture
EDDIE SAYS
Electromagnets are used for medical, industrial and manufacturing reasons.
• Question 8

Select TWO uses of electromagnets.

loudspeakers
door bell
EDDIE SAYS
Electromagnets are used in loudspeakers and door bells.
• Question 9

Select TWO more uses of electromagnets.

amplifiers
junk yards
EDDIE SAYS
Amplifiers contain electromagnets and they use them in junk yards to separate metal objects from other junk.
• Question 10

Select the two medical uses of electromagnets:

removing objects from eyes
CAT scan equipment
EDDIE SAYS
The options are all uses of electromagnets, but the question specifically asks for the medical uses.
---- OR ----

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