Define the term electric power and circuit its SI units.

Explanation

The electrical power P is the rate at which the electrical potential energy is delivered,
`P=(dW)/(dt)=(d)/(dt)(V.dQ)=V=(dQ)/(dt)" "...(1)`
Since the electric current `I=(dQ)/(dt)`
So the equation (1) can be rewritten as
`P=VI`
This expression gives the power delivered by the battery to any electrical system, where I is the current passing through it and V is the potential difference across it. The SI unit of electrical power is watt.