Electrical Energy

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Electrical appliances are designed to be as efficient as possible.


The power of an appliance is the rate at which it transfers energy. It is measured in watts. An appliance with a power of 1 watt transfers 1 joule of energy into other forms every second.

P= E / t, where P= power in watts, E= energy transferred in J, t= time in seconds

We can also write the efficiency equation in terms of power:

Efficiency = useful power out / total…


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