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Simple Definitions

The most important electronics terms, demystified in one place.


Our Take

The unit of measurement of power. As power is the product of current and volt, watts are measured the same way. For example, 1 amp at 5 volts is 5 watts. Or 5 amps at 1 volt is 5 watts.

Book Definition

Unit of real power. Equal to I2R or VI cos θ.


The watt (symbol: W) is a unit of power. In the International System of Units (SI) it is defined as a derived unit of 1 joule per second,[1] and is used to quantify the rate of energy transfer. In dimensional analysis, power is described by

{\displaystyle {\mathsf {M}}{\mathsf {L}}^{2}{\mathsf {T}}^{-3}}

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