Magnetism, Electricity and Gravity

The buildup of electrical charges on an object is called  __________  .

• 1. static electricity

• 1. electric electricity

• 1. current electricity

You accidentally drop a permanent magnet on the floor during science lab. Which of the following would be most likely occur?

• 1. The magnetism may weaken.

• 1. The magnetism may strengthen.

• 1. The magnet may reverse its poles.

Particles that have the same kind of charge will attract each other.

• True

• False

An electric generator produces 10 megawatts. The amount is equivalent to

• 1. 10,000 watts

• 1,000,000 watts

• 10,000,000 watts

• 0.010 watt

Different electromagnetic waves travel through a vacuum at different speeds.

• True

• False

When you are at home, turning off a light usually does not turn off your T.V. This is because

• 1. most electrical devices in a house are on parallel circuits.

• 1. most electrical devices in a house are on series circuits.

• 1. they have different sources of voltage.

• 1. a T.V. does not require electricity.

If you increase the resistance in a series circuit,                               .

• 1. the current will also increase

• 1. the current will decrease

• 1. the voltage will increase

• 1. the voltage will decrease

                    occurs when electric charges build up on objects, such as when materials are pulled apart or rubbed together, causing positive (+) charges to collect on one material and negative (−) charges on the other surface.

• 1. static electricity

• 1. magnetism

• 1. dynamic electricity

• 1. capacitance

Electric current is measured in                .

• 1. amperes

• 1. watts

• 1. meters

• 1. inches

Which of the following is a source of direct current?

• 1. wall outlet

• 1. battery

• 1. bar magnet

• none of the above