Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law equations
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law equations. Provide any 2 values to get the other values in the equations V = I × R and P = V × I.
⚡ Electrical Values
📊 Calculation Results
📚 Understanding Ohm's Law
Basic Formula
Ohm's Law states that V = I × R, where V is voltage in volts, I is current in amperes, and R is resistance in ohms.
Power Calculation
Electrical power can be calculated using P = V × I, P = V²/R, or P = I² × R, depending on which values you know.
Practical Applications
Use Ohm's Law for circuit design, troubleshooting electrical problems, and calculating safe operating parameters for electrical devices.
What is Ohm's Law?
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points. This fundamental principle is true for many materials over a wide range of voltages and currents, and the resistance and conductance of electronic components made from these materials remain constant.
Ohm's Law is valid for circuits that contain only resistive elements (no capacitors or inductors), regardless of whether the driving voltage or current is constant (DC) or time-varying (AC).
The Three Forms of Ohm's Law
Voltage equals current times resistance
Current equals voltage divided by resistance
Resistance equals voltage divided by current
Power Formulas
Power equals voltage times current
Power equals voltage squared divided by resistance
Power equals current squared times resistance