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Power Rating for various Appliances in the Home
Electrical appliances used around the home are rated in Watts and electricity is sold by the kilowatt-hour. This is equivalent energy used by a device rated at 1000 W running for 1 hour, or 3.6 x 106 J. This is also the same energy as a Board of Trade Unit (BTU) (Not to be confused with the (British Thermal Unit) b.t.u. which describes the power of heating and cooling systems.)
To give some idea of how much energy electrical items consume the table below lists various electrical appliances and their power ratings.
| Appliance | Power Rating (W) |
| Water Heater | 4000 |
| Electric Cooker, Hob (one ring) | 2000 |
| Electric Cooker, Oven | 1500-2500 |
| Microwave Oven | 600-900 |
| Washing Machine | 2750 |
| Vacuum Cleaner | 800 - 1200 |
| Toaster | 1200 |
| Electric Kettle | 1200 - 2200 |
| Hair Dryer | 1000 |
| Plasma Television | 328 |
| LCD Television | 193 |
| CRT Television | 146 |
| Fridge | 110 |
| Incandescent Light Bulb | 40 - 100 |
| Computer | 78 |
| Laptop Computer | 65 |
| PlayStation II | 30 |
| Energy Efficient Light Bulb | 15 |
| Wireless Router | 7 |
| CRT Standby | 3 - 11 |
| Charging Mobile Phone | 3 |
| Solar Powered Calculator | 0.04 |
The actual cost of running all this equipment depends on how much a kilowatt of power costs and how long you use each appliance. However, it is clear that the most power hungry appliances are those used for heating things. What is surprising, is the high power consumption of LCD televisions in comparison to traditional CRTs.