Ohm's Law Explained – Voltage, Current, and Resistance

Ohm's Law is the foundational principle of electrical circuit analysis. It states that the voltage across a conductor is directly proportional to the current flowing through it, with resistance being the constant of proportionality. Written as V = IR, this single equation governs the design of every electrical circuit in the world — from microchips to power grids.

CalcPlanet – Free Online Calculators

725+ free calculators and 108 tools for math, money, health, and everyday life. Instant results, verified formulas, no sign-up.

· Reviewed against our Editorial Standards and Formula Sources.

CalcPlanet calculators are free, privacy-first, and formula-reviewed.

Editorial Standards · Formula Sources · Privacy · Terms · Contact