Chapter 7 Review Magnetism

Front

What type of current does a dry-cell battery produce?

Back

Direct current (DC) is produced by a dry-cell battery.

Front

When two magnets are brought close to each other, what happens to their magnetic fields?

Back

Their magnetic fields attract or repel each other, and they can also combine or get larger.

Front

What type of transformer does a hydroelectric power plant use to develop the voltages needed for transmission?

Back

A step-up transformer is used to increase voltage for transmission.

Front

What is the function of an electric motor?

Back

An electric motor converts electric energy into kinetic energy.

Front

What is the region of space around a magnet where magnetic forces are exerted called?

Back

This region is called the magnetic field.

Front

What is the difference between alternating current (AC) and direct current (DC)?

Back

AC changes direction periodically, while DC flows in one direction only.

Front

What is a magnetic domain?

Back

A magnetic domain is a region within a material where the magnetic moments are aligned in the same direction.

Front

What is the purpose of a transformer in electrical systems?

Back

A transformer is used to change the voltage of an electrical current.

Front

What happens to the magnetic field when a current flows through a wire?

Back

A magnetic field is created around the wire when current flows through it.

Front

What is an electromagnet?

Back

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