Ohm's Law: The current (\(I\)) through a conductor is directly proportional to the potential difference (\(V\)) across its ends, provided the temperature remains constant.
\[V = IR\]
Equivalent Resistance for Parallel Combination:
\[\frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}\]