Electricity and Magnetism

The buildup of charges on an object is called

• static discharge.

• negative charge.

• positive charge.

What provides the pressure to move current in a circuit?

• voltage

• energy

• electricity

If a 500 watt electric heater runs for 8 hours, what is the total amount of kilowatt hours of electrical energy used? (EE = P x T/1000)

• 4 kilowatt-hours

• 4000 kilowatt-hours

• 400 kilowatt-hours

Ohm’s law is based on a relationship between

• voltage and resistance

• open and closed circuits

• current, voltage and resistance

The purpose of a circuit breaker is to

• keep your house wiring from over heating and causing a fire

• provide an open circuit to keep electrical appliances working.

• keep track of how much electricity you use in a month

A complete, unbroken path through which electric charges can flow is a(n)

• closed electric circuit

• electrical resistance.

• open electric circuit

Materials through which charge can flow easily are called

• insulators.

• conductors.

• resistors.

If an electric water heater uses 400w of power and runs for 10 hours, what is the total amount of energy used? EE= P x T/1000

• 4 kilowatt-hours

• 4000 kilowatt-hours

• 0.4 kilowatt-hours

According to Ohm’s law, resistance is equal to voltage divided by

• current

• potential.

• time.

A complete, unbroken path through which electric charges can flow is a(n)

• magnetic pole.

• electric circuit.

• electrical resistance.