Spiral Review Electricity

Front

What happens when a balloon is rubbed on hair?

Back

The balloon becomes negatively charged, and the hair becomes positively charged, causing them to attract each other.

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

How can you increase the strength of an electromagnet?

Back

By increasing the current flowing through the wire or increasing the number of coils around the core.

Front

What materials are best for the core of an electromagnet?

Back

Ferromagnetic materials like iron, nickel, or cobalt are best for the core.

Front

What is static electricity?

Back

Static electricity is the buildup of electric charge on the surface of objects.

Front

What is the principle of attraction between charged objects?

Back

Objects with opposite charges attract each other, while objects with like charges repel each other.

Front

What is the role of coils in an electromagnet?

Back

Coils of wire create a magnetic field when an electric current passes through them.

Front

What happens to the force of magnetism when magnets are closer together?

Back

The force of magnetism is stronger when magnets are closer together.

Front

What is the effect of temperature on magnetism?

Back

Generally, increasing temperature can decrease the strength of a magnet.

Front

What is the difference between conductors and insulators?

Back

Conductors allow electric current to flow easily, while insulators resist the flow of electric current.