AQA GCSE Power of Appliances

AQA GCSE Power Ratings of Appliances

Power Ratings of Appliances

In our homes we have many different electrical appliances. Each appliance has a power rating. 

Power is the rate of energy transfer

So, the higher the power rating the more energy is transferred per second. 

Power ratings are measured in Watts, although sometimes the label on the appliance will quote kW instead, see the diagram below for an example.

Picture of a fridge with a product label showing the power
Name of AppliancePower rating in Watts,W
Mobile phone charger5
Light bulb10
Ceiling fan 50
Microwave oven 1000
Air conditioner2000
Tumble dryer2400
Kettle2500
Electric water heater3000
Electric shower5000

Practice Questions

1.State the definition of power

2.Suggest a power value for the following appliances

(a)Mains powered radio

(b)TV

(c)Dishwasher

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.

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