Electricity Review

Calculate Current. What is the current through the circuit shown above?

• 0.80 A

• 1.60 A

• 0.4 A

• 4 A

Calculate Current. A toy car with a resistance of 20Ω is connected to a 3-V battery. What is the current in the car?

• 0.15 A

• 0.3 A

• 1.5 A

• 3 A

Estimate Electrical Energy. The current in an appliance connected to a 120-V source is 2A. Approximately how many kilowatt-hours of electrical energy does the power company provide for the appliance in 4h?

• 1 kWh

• 2 kWh

• 3 kWh

• 4 kWh

Hannah has a calculator that uses a 9-V battery and draws 0.1A of current. What is the power of Hannah's calculator?

• 0.9 W

• 1.0 W

• 2.0 W

• 1.1 W

During a science experiment, Henry is trying to determine which material is a conductor. He has the following options:

• glass

• wood

• copper

• plastic

Resistance in wires

• increases current.

• destroys energy in a circuit.

• converts electrical energy to other forms of energy.

• converts other forms of energy to electrical energy.

The electric force between two charged objects depends on which of the following?

• their masses and their separation

• their speeds

• their charges and their separation

• their masses and their charges

The object shown is a

• resistor.

• battery.

• circuit breaker.

• fuse.

Which does not provide a significant voltage difference in a circuit?

• wet cell

• wires

• electrical outlet

• dry cell

A commonly used unit for electrical energy is the

• kilowatt-hour.

• ampere.

• ohm.

• newton.