With great power comes great energy

The diagram shows a circuit.

The electromotive force of the circuit is 10 V.

Assuming that the bulb has a resistance of 2 Ω, what is the power output of the bulb?

• 4 W

• 6 W

• 8 W

• 10 W

How much energy is dissipated when using an electric kettle with a power rating of 230 W for 1 minute?

• 0 J

• 230 J

• 13 800 J

• not enough information provided

Which of the following correctly categories different forms of energy into renewable and non-renewable energy?

• A

• B

• C

• D

A wire dissipates P power when a current of I is passing through it. Assuming the current stays constant, what will be the new power dissipated by the wire if the length of the wire is halved?

•  2 P

• 4 P

An induction cooker with a power rating of 2 kW is being used for 30 minutes daily.

Assuming the cost of electricity is $0.20 per kWh, what is the cost of operating this induction cooker every week?

• $0.20

• $1.40

• $12.00

• $84.00