Answers to GCSE Power of Appliances

Practice Questions

1.State the definition of power

Rate of energy transfer

2.Suggest a power value for the following appliances

(a)Mains powered radio

Any value between 5 to 50W

(b)TV

Any value between 40W and 150W

(c)Dishwasher

Any value between 1500W and 2900W

3. Explain why the cost of keeping a low-power appliance running for long duration equals that of a high-power appliance used for the same short period.

Cost is based on total energy used. 

Using a high power appliance for a short period of time, will use the same total amount of energy as using a low power appliance for a long period of time.