# How Much Electricity Does a Computer Use Per Hour?

The hourly use of electricity by computers is determined by the type of computer and the connected peripheral devices. Typical desktops use about 65 to 250 watts while LCD and CRT monitors use about 40 and 80 watts respectively. However, laptops and energy efficient PCs use less electricity per hour.
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How Much Electricity Does a Computer Use Per Hour?
Computers have become much more energy efficient since the early days, when electronic monsters such as the 1940s ENIAC consumed 150,000 watts of power, including 20,000 for its cooling fans. But answering the question of how much electricity a computer... More »
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 A desktop computer consists of a computer tower and a separate monitor. LCD monitors use less electricity than a CRT monitor, with older CRT monitors using even more. A CRT monitor http://www.ehow.com/info_12041024_much-electricity...
 It will depend on the specification of your PC. Check out this article on PC power consumption: http://www.infobarrel.com/PC_pow... Embed http://www.quora.com/How-much-electricity-does-a-r...
 First, divide watts by 1000 to get kilowatts: watts / 1000 = kW. Then multiply kilowatts by the hours of usage to get kilowatt-hours. kW * hours = kWh. Finally, multiply kilowatt-hours http://wiki.answers.com/Q/What_is_the_formula_for_...
 A Watt is a joule per second. So in a whole hour there are 360 seconds. 500 x 360 = 180. kilojoules in a whole day there are 8640 seconds. 500x 8640 = 4320 kilojoules http://www.ask.com/question/does-your-wind-turbine...
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It will depend on the specification of your PC. Check out this article on PC power consumption: http://www.infobarrel.com/PC_pow... Embed ...
140W + 150W = 300W = 0.3kW 0.3kW x 50 hours = 15kW-hrs 15kW-hrs x 11.2 cents = 168 cents. ...
A unit of electricity costs between 4p and 12p depending on your electricity supplier and the level of usage. A unit of electricity is equal to 1,000 Watts of ...