Current Electricity

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

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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}