Question

(a) Define electric power. State its unit. Also derive formula of power P = V x I

Answer 1

power is voltage diff multiplied by i... t means avg energy suppled by body in unit tme

Answer 2

Electric current is defined as the amount of charge crossing any cross sectional area of the conductor in one second.
Its units are Ampere
Let Q be the charge crossing through any cross section of the conductir in the time interval T .Then the amount of charge crossing through that cross sectional area in one second is Q/T.Therefore,
Electric current=electic charge /time
I = Q/T
Power is the rate of work done.
So ,W/T represents electric power (p).
Electric power P = V* I.