How does the Ohm's Law Calculator work?

Enter any two of the three values: voltage (V), current (I), or resistance (R) Then: The calculator solves for the missing value using V = I × R Then: Results display the calculated value with step-by-step work shown.

Can you give an example of how to use the Ohm's Law Calculator?

Example: Input V = 12V, R = 4Ω gives a result of I = 3A (12 ÷ 4 = 3 amps).

Is the Ohm's Law Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Ohm's Law Calculator?

Our Ohm's Law Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Specialiserat

Ohm's Law Calculator

Voltage (V)

Current (A)

Resistance (Ω)

Ohm's Law describes the fundamental relationship between voltage, current, and resistance in electrical circuits. It states that the current flowing through a conductor is directly proportional to voltage and inversely proportional to resistance.

Symbol	Name	Unit	Description
V	I × R	—	I × R
I	I value	—	Variable used in the calculation
R	R value	—	Variable used in the calculation

Difficulty:beginner

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Did You Know?

Georg Ohm discovered this law in 1827, but the scientific community initially rejected it. It took years of experimental verification before his work gained acceptance.

References

›Ohm's Law Overview

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