Ohm's law
Also: V=IR
The relationship among voltage, current, and resistance for an ohmic element.
V = IR models a linear resistor under its stated thermal and operating conditions; it is not a universal component law.
- Formula
V = IR
Example A 330 Ω resistor carrying 4 mA drops about 1.32 V.
Common misconception Ohm's law does not make LEDs, batteries, or motors constant resistances.