Electric power Totally Explained

Everything about Electric Power totally explained

Electric power is defined as the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt.
When electric current flows in a circuit with resistance, it does work. Devices convert this work into many useful forms, such as heat (electric heaters), light (light bulbs), motion (electric motors) and sound (loudspeaker). Electricity can be produced by generation or from storage such as batteries.

Mathematics of electric power

In circuits

Electric power, like mechanical power, is represented by the letter P in electrical equations. The term wattage is used colloquially to mean "electric power in watts."
In direct current resistive circuits, instantaneous electrical power is calculated using Joule's Law, which is named after the British physicist James Joule, who first showed that heat and mechanical energy were interchangeable. ť

P = V I ,

where ť

P

is the power (watt or W)

V

is the potential difference (volt or V) ť

I

is the current (ampere or A)

For example: ť

2,mbox. ,

The result is a scalar since it's the surface integral of the Poynting vector.

Further Information

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