Science Unit B Chapter 3 Electricity and Magnetism Study Guide

What is electric current?

• The positive charges through matter

• The negative charges through matter

• Magnetism through matter

• Energy and light through matter

Why is electric wire coated with plastic or rubber?

• Plastic and rubber melt very slowly

• Plastic and rubber conduct the flow of electricity

• Plastic and rubber are inexpensive and easy to make

• Plastic and rubber are good resistors/insulators.

What can happen if your connect too many appliances to one circuit?

• The wires can blow up.

• The wires can generate more power and heat.

• The wires can overheat and cause a fire.

• The wires can give you a shock if you touch them.

What happens every time you turn on a light?

• You open a closed circuit.

• You close an open circuit.

• You add a source of power to a circuit.

• You remove a source of power from a circuit

What happens when two objects have different electric charges?

• They will pull toward each other

• They will gain energy

• They will lose matter

• They will push away from each other

The invention of the compass showed that Earth acts like a giant __________.

• generator

• insulator

• magnet

• switch

An ________________ is created when electric current flows through a wire.

• insulator

• inference

• electromagnet

• engine

What will happen if you hold the south poles of two magnets near each other?

• The poles will spin clockwise.

• The poles will spin counterclockwise.

• The poles will attract each other.

• The poles will repel each other.

When you turn off one lamp, all the lights in the room go off. What must the electric appliances be connected to?

• a series circuit

• a parallel circuit

• a generator

• an electromagnet

Which statement about magnetism is correct?

• A magnet's force is greatest at its poles.

• The smaller a magnet, the greater its force.

• Magnets attract all types of metals.

• The S pole of a magnet always points north.