Chapter-3|Current Electricity| NCERT 12th Physics:
Electrical Power:
It is defined as the rate of electrical energy supplied per unit time to maintain flow of electric current through a conductor.
One Watt:
Power of an electric circuit is said to be 1 Watt, If 1 ampere current flow in it against a potential difference of 1 volt.
The bigger unit of electrical power are kilowatt(KW) and megawatt(MW).