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This lesson covers power and how to calculate it using P=tE and P=tW, as required by the Edexcel GCSE Combined Science specification (1SC0). Understanding power allows you to compare how quickly different devices transfer energy.
Power is the rate at which energy is transferred or the rate at which work is done.
The unit of power is the watt (W).
1 W=1 J/s
One watt means one joule of energy is transferred per second.
There are two versions of the power equation:
P=tEandP=tW
where:
Both equations say the same thing — power is energy (or work done) divided by time.
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