Ohm’s Law is a fundamental principle in electrical engineering and physics that describes the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. It states that:

V=I×R

Where:

V is the voltage across the circuit (measured in volts, V).
I is the current flowing through the circuit (measured in amperes, A).
R is the resistance of the circuit (measured in ohms, Ω).

This equation illustrates that the voltage across a circuit is directly proportional to the current flowing through it, with the proportionality constant being the resistance of the circuit.

Ohm’s Law can be rearranged to solve for any one of the three variables (VV, II, or RR) if the other two are known. The rearranged forms of Ohm’s Law are:

Ohm’s Law is fundamental to understanding and analyzing electrical circuits, and it is used extensively in circuit design, analysis, and troubleshooting. It provides a simple yet powerful tool for calculating voltages, currents, and resistances in both DC (direct current) and AC (alternating current) circuits.

Back to Glossary Index Page