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.
Absorption and Emission of EM Radiation
JJ Thomson and Plum pudding model
Ernest Rutherford and the Nuclear Model
Niels Bohr changing the Nuclear Model
Discovering the Proton and Neutron
Measuring radiation from radioactivity
Radiation types and properties
Random nature of radioactive decay
Radioactive contamination or irradiation
Hazards of contamination and irradiation
Studies on the effects of radiation on humans
Different half lives of radioactive isotopes
Nuclear Fission Chain Reaction
Writing nuclear fission equations