Ohm’s Law Definition

Learn about Ohm’s Law, a fundamental principle in electrical engineering, and how it relates to voltage, current, and resistance.

What is Ohm’s Law?

Ohm’s Law is a fundamental principle in the field of electrical engineering, stating that the current passing through a conductor is directly proportional to the voltage across it and inversely proportional to the resistance of the conductor.

The Formula

The mathematical expression of Ohm’s Law is: V = I * R where

  • V is the voltage in volts
  • I is the current in amperes
  • R is the resistance in ohms


For example, if a circuit has a voltage of 12 volts and a resistance of 4 ohms, the current flowing through the circuit would be 3 amperes. This can be calculated using the formula V = I * R.

Case Study

In a household circuit, if the voltage supplied by the power source is 120 volts and the total resistance of all the appliances connected is 10 ohms, the current passing through the circuit would be 12 amperes according to Ohm’s Law.


Ohm’s Law is widely used in electrical engineering and plays a crucial role in designing and analyzing electrical circuits. It is the foundation of many electronic devices and systems that we use in our daily lives.

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