Resistance

Definition

$$ \large R = \frac{V}{I} $$

Resitance of a Wire

$$ \large R = \frac{\rho L}{A} \propto \frac{L}{A} $$

Combinations of Resistors

$$ \large R_{serial} = R_1 + R_2 $$$$ \large R_{parallel} = \frac{1}{R_1} + \frac{1}{R_2} $$
  • GRE Physics GR1777: Problem 004

Ohm's Law

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