Wikipedia defines Watt (symbol: W) as a derived unit of power in the International System of Units (SI). It measures rate of energy conversion. One watt is equivalent to 1 joule (J) of energy per second

If you bought a 100W light bulb the usage is as follows.

Using a 100 watt light bulb for 1 hour consumes 0.10 kilowatt hours (KWh) of electricity. Using a 100 watt light bulb for 10 hours consumes 1 kilowatt hours (KWh) of electricity. Using a 100 watt light bulb for 100 hours consumes 10 kilowatt hours (KWh) of electricity. Using a 100 watt light bulb for 1000 hours consumes 100 kilowatt hours (KWh) of electricity.   If you use a 100W light bulb for five hours every day the annual usage is 182,500 W or 182.5 KWh (100W x 5h X 365d). Thus if you are paying about 0.11¢ per KWh the light bulb usage for the year cost you about $20.

How much are you paying per KWh?

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