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Square oneDefinition of energy
Energy is the ability of a system to produce a work carrying a movement, a light or a heat.
The unit of measure of energy in the I.S. (International System) is the Joule. The power of a system is the energy developed by this system by the unit of time. The power is measured in watts (W). To measure the energy consumption, we multiply the power by the time: an electric device that works at a power of 1kW during 1 hour consumes 1 kilowatt hour (kWh).
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