Electric power is defined as the power dissipated by an electric circuit. Electric power is a measurement of the rate at which energy is used over a period of time. The SI unit for power is the watt, the unit for energy is the joule, and the unit for time is the second.

For a direct current circuit, electric power equals the electric current multiplied by the voltage.

When electric current flows through a circuit, it is slowed down by the resistance in the circuit. Devices can convert this current to useful forms of work, such as heat radiation, light emission, mechanical motion, or acoustic vibrations.

• Electric power transmission
• Electric power distribution
• Electrical generator

• Reports on August 2003 Blackout, North American Electric Reliability Council website Archived 2006-06-16 at the Wayback Machine
• Croft, Terrell; Summers, Wilford I. (1987). American Electricians' Handbook (Eleventh ed.). New York: McGraw Hill. ISBN 0-07-013932-6. Archived from the original on 2006-06-17. Retrieved 2007-04-09.
• Fink, Donald G.; Beaty, H. Wayne (1978). Standard Handbook for Electrical Engineers (Eleventh ed.). New York: McGraw Hill. ISBN 0-07-020974-X. Archived from the original on 2006-10-16. Retrieved 2007-04-09.

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