Physics

Ohms Law Calculator

Solve voltage, current, or resistance and compute electrical power.

Last validated: 2026-02-14

Ohms Law Calculator solves voltage, current, resistance, or power from basic circuit relations. It is useful for electronics learning and troubleshooting simple circuits. The tool quickly checks expected electrical values. Use it before component selection or bench testing.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Ohm's Law Inputs

Use V = I * R and power P = V * I.

Result

Solved value: 12.000000

Power: 24.000000 W

How to use this tool

Enter known circuit values and choose unknown output.
Run the calculator to compute missing electrical parameter.
Check computed result against component and safety limits.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Mode: find_voltage
Voltage: 12.0
Current: 2.0
Resistance: 6.0
Power: 24.0

Expected Outputs

Voltage: 12
Current: 2
Resistance: 6
Result: 12

Interpretation

Voltage is 12.0. Use this as a decision input, not as a standalone conclusion.
Current is 2.0. Use this as a decision input, not as a standalone conclusion.
Resistance is 6.0. Use this as a decision input, not as a standalone conclusion.
Confirm unit consistency and operational constraints before applying this result in production or field conditions.

Scenario Compare (A vs B)

Use this to compare two input sets and quantify change in key outputs.

Scenario A

Mode

Voltage

Current

Resistance

Power

Scenario B

Mode

Voltage

Current

Resistance

Power

Confidence and limitations

Outputs are deterministic formula results and depend entirely on input quality and units.
Results are for planning and learning; verify with domain standards before safety-critical use.
Models are idealized and may ignore drag, friction, nonlinearity, and measurement error.

Formula References

SI-unit forms of classical mechanics and wave equations.
Idealized models unless explicitly stated otherwise.

Assumptions

Outputs are deterministic formula results and depend entirely on input quality and units.
Results are for planning and learning; verify with domain standards before safety-critical use.
Models are idealized and may ignore drag, friction, nonlinearity, and measurement error.

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