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Mega means million and a watt is a unit of power. A megawatt hour is the amount of power used if 1,000,000 watts are used for 1 hour, or 1 watt is used for 1,000,000 hours. If 100 light bulbs each using 1,000 watts of power are turned on for 10 hours, they will use 100 x 1,000 x 10 watt hours = 1,000,000 watt hours = 1 megawatt hour. Most electric companies charge for the number of kilowatt hours used. A megawatt hour is 1,000 kilowatt hours.

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No. You can thnk of a megawatt hour as the number of megawatts that have been used in one hour.

A megawatt is a measure of power. A megawatt is 1,000,000 watts or 106 watts. A Watt is the same as a Joule/second.

A megawatt hour is a measure of energy. One megawatt hour is (106 watts)*(3600 seconds) or 3.6 * 109 watt seconds. Since a watt is a joule/second a megawatt hour is also 3.6 * 109 joules with the joule being the SI unit for energy.

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You cannot 'use' watts or megawatts. A watt is simply the rate at which you 'use' energy. So, the first sentence of the above answer should read: "You can think of a megawatt hour as the amount of energy used in one hour at the rate of one megawatt'.

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Q: Calculate what a megawatt hour is?
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