MathLiveElectrical power dissipation law
Gives the electrical power delivered to a circuit element with voltage V across it and current I through it (P = VI, valid for any element). The forms I^2R and V^2/R follow from Ohm's law and apply only to resistors (ohmic elements), where the power is converted to heat.
P = VI = I^{2}R = \frac{V^{2}}{R}What the symbols mean
| electrical power (W) | |
| voltage across the element (V) | |
| current through the element (A) | |
| resistance (\Omega) |
About this formula
- FieldPhysics
- TopicElectricity and circuits
- LevelHigh school
- Also calledpower dissipation, electrical power formula, joule heating power, electric power in resistor, Joule's first law
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