Formula and method
V = IR and P = VI. With power and resistance known, I = √(P/R) and V = √(PR).
Worked example
A 6 Ω resistor carrying 2 A has 12 V across it and dissipates 24 W. Each supported input pair yields the same values.
Ohm’s Law Calculator
Solve voltage, current, resistance and power for an ideal resistor from a supported pair of known quantities.
Printed from Calxy · https://www.calxy.net/other/ohms-law-calculator
Voltage12.0000 V
V
1e-9 – 1000000000
A
1e-9 – 1000000000
Voltage
12.0000 V
- Current2.0000 A
- Resistance6.0000 Ω
- Power dissipated24.0000 W
Positive magnitudes for an ideal resistor in DC or purely resistive RMS AC conditions. It does not model reactive impedance, component ratings or installation safety.
How this was calculated
Ohm’s law: V = I × R.
Resistive power: P = V × I = I²R = V²/R.
Frequently asked questions
Can this calculate reactive AC circuits?
No. It models an ideal resistance. AC circuits with capacitors or inductors require impedance and phase calculations.
Last updated . Results are estimates for informational purposes only.