CBSE Class 10 Answered

Electric power is defined as the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt. Electrical power is distributed via cables and electricity pylons .When electric current flows in a circuit with resistance, it does work. Devices convert this work into many useful forms, such as heat (electric heaters), light (light bulbs), motion (electric motors), sound (loudspeaker) or chemical change.

q = i x t , where q is the charge , i is the current , t is the time, W is the work done,R is resistance,P is the power

W = V q

W = i² R t

W= V² t / R

 P = W / t

P= V i = i² R = V₂ R