Electricity & Magnetism

Formulas for circuits, electric forces, and fields.

Ohm's Law

I = \frac{U}{R}

Electric Power

P = UI = I^2R

Resistivity / Resistance Formula

R = \rho \frac{l}{S}

Coulomb's Law

F = k \frac{|q_1 q_2|}{r^2}

Lorentz Force

F = qvB \sin\alpha

Resistors in Series

R_{eq} = R_1 + R_2 + \dots

Resistors in Parallel

\frac{1}{R_{eq}} = \frac{1}{R_1} + \frac{1}{R_2} + \dots

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