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Power and Energy Formulas

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Ohm's Law

$V = IR$

Electrical Power

$P = VI = I^2R = \frac{V^2}{R}$

Energy Consumption

$E = P \times t$

Capacitive Reactance

$X_C = \frac{1}{2\pi fC}$

Inductive Reactance

$X_L = 2\pi fL$

Impedance in a Series RLC Circuit

$Z = \sqrt{R^2 + (X_L - X_C)^2}$

Instantaneous Electrical Power

$p(t) = v(t) \times i(t)$

Three-Phase Power

$P = \sqrt{3} \times V_L \times I_L \times \cos(\phi)$

Single-Phase Power in Resistive Loads

$P = V \times I$

Energy Stored in a Capacitor

$E = \frac{1}{2}CV^2$

Energy Stored in an Inductor

$E = \frac{1}{2}LI^2$

Power Factor

$\text{Power Factor} = \cos(\phi)$

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