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Which of the following is a unit of power?

A All of the above
Explaination
Power is the rate of doing work i.e. Power = Work/time = J/s. Electrical power is described as P = VI and the unit of power is Watt (W). Power is the product of current and voltage, so it can also be written as V.A where V represents the voltage and A represents the current.
B J/s
C W
D V.A