Power consumption

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Power consumption from different mobile devices

In electrical engineering, power consumption refers to the electrical energy per unit time,[1] supplied to operate something, such as a home appliance. Power consumption is usually measured in units of watts (W) or kilowatts (kW).[2]

The energy used by equipment is always more than the energy really needed. This is because no equipment is 100% efficient. Power is wasted as heat, vibrations and/or electromagnetic radiation. For example, a light bulb does not only convert electric power into light; it also makes some heat.

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