
Electrical power is the rate of transfer of electrical energy, for instance by an electrical appliance.
Electrical power is measured in Watts (W).
Power = Work done (in Joules) divided by time taken (in seconds).
So, a 1000W hairdryer, for example, will convert 1000J of electrical energy per second.
But, because electrical current measures how many electrons flow, and the voltage tells us how much energy each one of them can transfer, then for electrical power, we can say that:
Power (in Watts) also equals the Voltage (Volts) x Current (in Amps)
which will allow us to decide which size fuse to use for the hairdryer, for example.
Mains voltage is 240, so 1000 is divided by 240 which shows that the fuse needed is 5A.
Anne Evans


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