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The big power Formulas:
Formula 1 - Electrical (electric) power equation: Power P = I × V = R × I² = V² ⁄ R
where power P is in watts, voltage V is in volts and current I is in amperes (DC).
If there is AC, look also at the power factor PF = cos φand φ = power factor angle
(phase angle) between voltage and amperage.
Formula 2 - Mechanical (mechanic) power equation: Power P = E ⁄ t = W ⁄ t
where power P is in watts, energy E is in joules, and time t is in seconds. 1 W = 1 J/s
Scroll down to related links and look at "Formulas and calculations - Electricity and Electric Charge".
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