Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to find the remaining parameters instantly. Perfect for electronics enthusiasts, students, and electrical engineers.
Ohm's Law is a fundamental principle in electrical engineering and physics that describes the relationship between voltage, current, resistance, and power in an electrical circuit. Named after German physicist Georg Ohm, this law is the foundation for understanding how electrical circuits work and is essential for anyone working with electronics.
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance. This simple relationship allows you to calculate any one of these values if you know the other two, making it an indispensable tool for circuit design, troubleshooting, and analysis.
A circuit has a 12V battery connected to a 4Ω resistor. To find the current: I = V/R = 12/4 = 3 amperes. The power dissipated by the resistor: P = V × I = 12 × 3 = 36 watts. This means the resistor must be rated for at least 36 watts to avoid overheating.
Enter any two values to calculate the others