Question

A 3kW kettle boils water in 4 minutes. Does this use more electrical energy than a 150W fridge left on 1 hour?

Answer 1

The kettle used more electrical energy

Step-by-step explanation:

We need to find the appliance that used more electrical energy.

To solve this problem, we need to find the amount of electrical energy used by both appliances.

For the kettle;

Power consumed = 3kW

Time = 4minutes

Electrical energy = Power x time

Convert 4min to hr;

60min = 1hr

4min =
`(4)/(60)` =
`(1)/(15)`hr

Electrical energy = 3 x
`(1)/(15)` = 0.2kwh

For the fridge;

Power consumed = 150W = 0.15kW

Time = 1hr

Electrical energy = 0.15kW x 1hr = 0.15kWh