Question

define power and derive it's expression in the form of V, I and R

Answer 1

rate of energy consumption is called power.
power=potential difference×current
.

Answer 2

The power is defined as it is measured in unit's of watt ,where watt is equal to a joule per second (1W=1 J/S) .

By ohm's law : V= IR

V= potential difference

I= current

R=resistance

Hope it is helpful...