Ohm's law is a fundamental principle in electronics that describes the relationship between voltage, current, and resistance in a circuit. It states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor. This relationship can be expressed with the formula: V = I × R, where V is voltage, I is current, and R is resistance. Understanding Ohm's law is essential for designing and analyzing electrical circuits. It helps engineers and technicians calculate how much current will flow in a circuit when a specific voltage is applied and how much resistance is needed to control that current. This law is crucial for ensuring the safe and efficient operation of electrical devices.