About this tool: Ohm’s Law Calculator
Calculate current, voltage or resistance from Ohm’s law and show electrical power.
Select the unknown quantity, then enter the other two. Resistance is in ohms, current in amperes and voltage in volts. Power is calculated from voltage times current. This model describes an ideal resistive DC load, rather than AC impedance or component heating limits.
How the calculation works
Worked example
| Mode | Find current |
| Voltage, V | 12 |
| Current, A | 0.1 |
| Resistance, Ω | 100 |
I = 0.12 A; P = 1.44 W
Questions and answers
What does this tool do?
Calculate current, voltage or resistance from Ohm’s law and show electrical power. Select the unknown quantity, then enter the other two. Resistance is in ohms, current in amperes and voltage in volts. Power is calculated from voltage times current. This model describes an ideal resistive DC load, rather than AC impedance or component heating limits.
What affects precision and input format?
Floating-point results are rounded for display. Keep the units shown in the input labels; decimal points and decimal commas are accepted.
Where are the calculations performed?
The calculation runs in your browser. You can use the tool without installing software.
Asted Cloud
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