Physics
Ohm Law Power
Calculate power using current or voltage and resistance.
P = I²R = V²/R
Formula Explanation
These forms are derived from P = VI and Ohm’s law.
Variables Explained
P = power; I = current; R = resistance; V = voltage.
Solved Example
A 4 Ω resistor carries 3 A. Find power.
P = 9 × 4 = 36 W.