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A watt is a meaasure of power. Power is the rate of work or rate of energy transfer. The volt is a measure of electric potential. Watts and Volts are related in a direct current (battery) circuit by the equation:

Power (Watts) = Electric Potential (Volts) x Current (Amps).

In an alternating circuit (home) power supply, power is measured by VA (Volt-Amps) as the current and voltage in these circuits can be out of phase due to capacitance and inductance which causes changes in current-voltage phase. As long as everything is measured in root-mean-squared (rms) the equation is the same as for the direct current for the active (resistive) part of the power. Root-Mean-Squared gives equivalent direct current measures.

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15y ago

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