gen-briefly-explain-ohm-s-law-and-one-common-misconception-about-7e8e

Briefly explain Ohm's law and one common misconception about it.

# Ohm's Law **Ohm's Law** states that voltage (V) equals current (I) multiplied by resistance (R): **V = I × R** This means that for a conductor at constant temperature, the current flowing through it is directly proportional to the voltage across it, with resistance being the constant of proportionality. ## Common Misconception **Misconception:** "Ohm's Law applies to all materials and components." **Reality:** Ohm's Law only applies to **ohmic materials** - conductors that maintain constant resistance regardless of the applied voltage or current (like most metals at constant temperature). Many components are **non-ohmic**, meaning their resistance changes with voltage or current: - Diodes - Transistors - Light bulbs (filament resistance increases with temperature) - Batteries (internal resistance varies) For non-ohmic materials, while V = IR still describes the relationship at any given instant, resistance isn't constant, so the relationship between voltage and current isn't linear.