Making an Electric Current with Magnets

Front

What is a temporary magnet?

Back

A temporary magnet is a material that can become magnetized when in contact with a magnet and can pick up small metallic objects, like a paperclip.

Front

How many coils of wire does a transformer typically have?

Back

A transformer typically has two coils of wire wrapped around an iron core.

Front

What is the relationship between the number of coils and the strength of an electromagnet?

Back

The strength of an electromagnet increases with the number of coils; more coils create a stronger magnetic field.

Front

What is the role of the ferromagnetic core in an electromagnet?

Back

The ferromagnetic core increases the strength of the electromagnet by concentrating the magnetic field.

Front

What type of transformer decreases voltage?

Back

A step-down transformer decreases the voltage of the current.

Front

What is an electromagnet?

Back

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

Front

What happens to the magnetic field when the electric current is turned off in an electromagnet?

Back

The magnetic field disappears when the electric current is turned off.

Front

What is the difference between a step-up and a step-down transformer?

Back

A step-up transformer increases voltage, while a step-down transformer decreases voltage.

Front

What materials are typically used for the core of an electromagnet?

Back

Ferromagnetic materials, such as iron, are typically used for the core of an electromagnet.

Front

How does the direction of current affect the magnetic field in an electromagnet?

Back

Changing the direction of the current reverses the direction of the magnetic field.