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Watt's law is an improper name used for the Basic Power Formula:
where
- P is the power in watts
- V is the potential difference in volts
- I is the current in amperes
The basic power formula is used to calculate the electrical power P dissipated in a resistor or a circuit, given the voltage V across it and the current I flowing in it. The voltage drop across a resistor is also referred to as the potential difference.
It is sometimes designated by E or U instead of V.
When combined with Ohm's law, Watt's law can be rewritten as:
where
- R is the electrical resistance in ohms.
References
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