What is Ohm's Law?

Ohm's Law states the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. The correct formulation of this law is expressed as V = I × R, which means that the voltage across a conductor is directly proportional to the current flowing through it when resistance is constant. This fundamental principle is essential in electrical engineering as it allows engineers and electricians to calculate how much voltage is needed to drive a specific current through a specific resistance.

Understanding this relationship is crucial for designing and troubleshooting electrical circuits, as it helps predict how changes in one variable affect the others. For instance, if you need to increase the current in a circuit, Ohm's Law enables you to determine how much voltage needs to be applied, assuming you know the resistance. This applicability in real-world scenarios underscores the importance of Ohm's Law in practical electrical work.