# Electric energy and power

Electric energy is defined as the total electric work done or energy supplied by the source of emf in maintaining the current in an electric Circuit for a given a time.The SI unit of electrical energy is joule (j).

Electric power is defined as the rate at which work is done by the source of emf in maintaining the current in the electric circuit.The SI unit of power is watt (w).

### View the Topic in this video From 01:10 To 40:45

Disclaimer: Compete.etutor.co may from time to time provide links to third party Internet sites under their respective fair use policy and it may from time to time provide materials from such third parties on this website. These third party sites and any third party materials are provided for viewers convenience and for non-commercial educational purpose only. Compete does not operate or control in any respect any information, products or services available on these third party sites. Compete.etutor.co makes no representations whatsoever concerning the content of these sites and the fact that compete.etutor.co has provided a link to such sites is NOT an endorsement, authorization, sponsorship, or affiliation by compete.etutor.co with respect to such sites, its services, the products displayed, its owners, or its providers.

1. Electric energy = Electric power × time = P × t

2. It is defined as the rate at which work is done by the source of emf in maintaining the current in the electric circuit.
\tt Electric \ power \ P = \frac{Electric \ work \ done}{time \ taken}

3. P = VI = I^2 R = \frac{V^{2}}{R}