Calculate the cost of using a 2000 W heater for 30 minutes at 10 cents per kWh.

A 5 A fuse is used for a 240 V appliance. What is the maximum power the appliance can safely use?

What is a kilowatt-hour (kWh) a unit of?

Rearrange E = I × V × t to make time (t) the subject.

A 60 W light bulb runs for 8 hours. How much energy does it use in kWh?

Which formula correctly defines electrical power?

An electric kettle has a power rating of 2.5 kW and operates at 230 V. What current does it draw?

Calculate the energy transferred when a 12 V battery supplies 3 A for 20 seconds.

A device transfers 3600 J of energy in 60 seconds. What is its power?

If electricity costs 12 cents per kWh, what is the cost of running a 3 kW heater for 5 hours?

Which statement about power is correct?

A motor lifts a 500 N weight by 10 m in 25 seconds. What is the power of the motor?

Which of these is NOT a correct unit for power?

A 230 V hairdryer has a power of 1.84 kW. What fuse should be used: 3 A, 5 A, or 13 A?

Two devices both transfer 7200 J of energy. Device A does it in 60 s, Device B in 120 s. Which statement is correct?