Using Electromagnets

Learning Objective: How are electromagnets used in everyday life? Recall what an electromagnet is and how to make one.

• Electromagnets are used in devices like electric bells and MRI machines. They are made by wrapping a coil of wire around an iron core and passing electric current through the wire.

• Electromagnets are only found in nature and cannot be made by humans.

• Electromagnets do not require electricity to function.

• Electromagnets are permanent magnets that do not lose their magnetism.

Learning Objective: How are electromagnets used in everyday life? Electromagnets are used in which of the following devices?

• Television remotes

• Refrigerator magnets

• Electric bells

• Wooden chairs

Electromagnets are used in which of the following everyday devices?

• Electric bells, circuit breakers, and loudspeakers

• Light bulbs, batteries, and solar panels

• Televisions, refrigerators, and microwaves

• Washing machines, fans, and heaters

How do you think they work?

• By using electricity

• By using water

• By using wind

• By using solar power

Fill in the blank: An electric bell uses an ________ to produce sound.

• electromagnet

• battery

• resistor

• capacitor

Fill in the blank: A circuit breaker is a safety device that uses an ________ to break the circuit when the current is too high.

• electromagnet

• insulator

• resistor

• condenser

How can we use electromagnets in the real world?

• In making electric bells, MRI machines, and maglev trains

• In making wooden furniture, glass bottles, and paper

• In growing plants, cooking food, and painting walls

• In making plastic toys, rubber bands, and cotton clothes

What is the main principle that allows maglev trains to float above the tracks?

• Gravity

• Magnetic repulsion

• Air pressure

• Steam power

Why can maglev trains travel faster than normal trains?

• They have bigger wheels

• There is no friction between the train and the track

• They use more fuel

• They are lighter

Read the passage below and fill in the blank: Very powerful __________ on the track repel magnets on the train. There is no friction between the train and the track.

• electromagnets

• batteries

• wheels

• rails