Electricity and Gas for the World!

IDT Energy Says: Know Your Watts!

Let’s get down to basics. What is meant by a kilowatt hour, anyway? This is the way electricity is measured; the amount we use is called a kilowatt-hour, or kWh. When you use a 1,000 watt appliance for one hour, you have used 1 kWh.

Here are some real examples:

1.    A medium window-unit air conditioner which uses 1,000 watts and is used for one hour has used 1 kWh.

2.    A large window -unit air conditioner which uses 1,500 watts and is used for one hour has used 1.5 kWh.

3.    A small window-unit air conditioner which uses 500 watts and is used for one hour has used 0.5 kWh.

4.    A ceiling fan on low speed which uses 24 watts and is used for one hour has used 0.024 kWh. If it is used for ten hours then it used 0.24 kWh.

5.    A 100 watt light bulb used for one hour uses 0.1 kWh. If it is used all month and is on 730 hours, then it uses 73 kWh.

6.    A 25 watt CFL light bulb used for the same 730 hours (all month) will use only 18 kWh.

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