Ohms Law Calculator
Free online Ohms Law Calculator.
Calculator
Formula: V = I × R
How to Use
- Enter the required values
- Click Calculate to see the result
- Review the detailed output
Formula
Ohm's Law: V = I x R. Power: P = V x I = I^2 x R = V^2/R. Where V = voltage (volts), I = current (amps), R = resistance (ohms), P = power (watts).
Example Calculations
Find Voltage
Input: Current: 2A, Resistance: 50 ohms
Result: Voltage: 100V, Power: 200W
Find Current
Input: Voltage: 120V, Resistance: 240 ohms
Result: Current: 0.5A, Power: 60W
Find Resistance
Input: Voltage: 12V, Current: 0.1A
Result: Resistance: 120 ohms, Power: 1.2W
About This Calculator
Free online ohms law calculator. Calculate instantly in your browser with our easy-to-use tool. No sign-up required.
Our ohms law calculator is free, easy to use, and provides instant results. All calculations are performed in your browser for privacy and speed.
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Frequently Asked Questions
What is Ohm Law?
V = IR. Voltage equals Current times Resistance in an electrical circuit.
Calculate voltage, current, or resistance?
V = I x R. I = V / R. R = V / I. Enter any two values to find the third.
Power formula?
P = VI. Combined with Ohm: P = I^2 x R and P = V^2 / R.
How does resistance affect current?
Higher resistance reduces current (I = V/R). Thicker wires (lower resistance) carry more current.
Limitations of Ohm Law?
Applies to ohmic materials only. Diodes, transistors, and incandescent bulbs are non-ohmic.