Electrical Power

Electrical power = potential difference × current.

P = V I

Electrical circuits are used to transfer energy from one place to another. Energy from a cell or other power source is transferred to a component which transfers the energy to another form of energy.The rate of energy transfer by a component is called the electrical power. The power depends on the potential difference across the component and the current through the component.Additional equations for power can be derived using V = IR giving:

P = I²R

and

P = V ²/R

Energy transferred W = V I t(p.d. × current × time)since W = power × time.