ohms law calculator
Published On: 25/02/2026
Ohm’s Law Calculator
Use Ohm’s Law to calculate Voltage (V), Current (I), Resistance (R), and Power (P). Enter any two values and the calculator will solve for the others.
Inputs explained:
• Voltage (V): electrical potential difference, measured in volts.
• Current (I): flow of electric charge, measured in amps.
• Resistance (R): opposition to current flow, measured in ohms (Ω).
• Power (P): rate of energy use, measured in watts (W).
Formulas: V = I×R, I = V/R, R = V/I, P = V×I = I²×R = V²/R
• Voltage (V): electrical potential difference, measured in volts.
• Current (I): flow of electric charge, measured in amps.
• Resistance (R): opposition to current flow, measured in ohms (Ω).
• Power (P): rate of energy use, measured in watts (W).
Formulas: V = I×R, I = V/R, R = V/I, P = V×I = I²×R = V²/R
Tip: For real circuits, component tolerances and temperature can affect results. This calculator assumes ideal values.
Ohm’s Law Calculator — Description
The Ohm’s Law Calculator helps you solve basic electrical relationships between voltage (V), current (I), resistance (R), and power (P). Enter any two known values and the calculator automatically computes the remaining values using Ohm’s Law and standard power formulas: V = I×R and P = V×I (also P = I²R and P = V²/R).
This tool is useful for students, DIY electronics, circuit planning, resistor selection, and quick checks when working with batteries, LED circuits, and power supplies.