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.
| Name of Appliance | Power rating in Watts,W |
|---|---|
| Mobile phone charger | 5 |
| Light bulb | 10 |
| Ceiling fan | 50 |
| Microwave oven | 1000 |
| Air conditioner | 2000 |
| Tumble dryer | 2400 |
| Kettle | 2500 |
| Electric water heater | 3000 |
| Electric shower | 5000 |
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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