This Ohm’s Law calculator finds voltage, current or resistance in a circuit.

It uses V = I × R, I = V ÷ R and R = V ÷ I with visible working.

The working panel shows the formula, substituted values and final answer with units.

Canonical folder: /ohms-law-calculator/

Choose FIND V, FIND I or FIND R on Page 1.

Enter the two known circuit values in the input boxes.

Press SOLVE to show the formula, substitution and answer.

Use EXAMPLE to restore sample values, or CLEAR to reset the calculator.

Use volts for voltage, amps for current and ohms for resistance.

The calculator assumes the values are already in matching circuit units.

If current is given in milliamps, convert it to amps before using Ohm’s Law.

Resistance cannot be calculated from R = V ÷ I when current is zero.

Students use this page for GCSE electricity, circuit equations and resistance questions.

Electronics learners use it to compare voltage, current and resistor values.

Teachers and tutors can use it to demonstrate formula rearranging.

The calculator starts on Page 1 so the input tool is always quick to reach.

People may search for Ohm’s Law calculator, Ohms law calculator or voltage current resistance calculator.

Other searches include V equals I times R calculator, VIR calculator and volts amps ohms calculator.

This page supports those searches with a working calculator, formula help and readable internal pages.

GCSE users may search for GCSE physics Ohm’s Law, circuit formula calculator or resistor calculator GCSE.

Homework searches may ask how to calculate voltage from current and resistance.

Other tasks ask how to calculate current or resistance from the other two circuit values.

The working panel shows the equation, substitution and final answer clearly.

What is Ohm’s Law? V = I × R links voltage, current and resistance.

What are the units? Voltage is V, current is A, resistance is Ω.

Can it find current? Yes. Choose FIND I and use I = V ÷ R.

Can it find resistance? Yes. Choose FIND R and use R = V ÷ I.

Why is my answer wrong? Check that current is in amps, not milliamps.

Can current be zero? Not when finding resistance with R = V ÷ I.

Can I use decimals? Yes. Decimal voltage, current and resistance values are supported.

Is this GCSE-friendly? Yes. It uses short formula and substitution steps.

Ohm’s Law connects to electrical power, energy transfer, resistance, current and voltage questions.

Related searches include electricity formula calculator, physics electricity calculator and Ohm’s Law with working.

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This page is designed for users who need a fast circuit answer, a visible formula and clear working.

It covers calculation intent, revision intent, homework intent and electronics troubleshooting intent.

The support text is split across full-size reading panels instead of compressed SEO boxes.

Use Ohm’s Law to calculate voltage across a resistor, current through a circuit or resistance value.

Use it when checking simple circuit diagrams, resistor questions and GCSE electricity examples.

For exam answers, write the formula, substitute the values, calculate, then add the correct unit.

NEXT loops back to Page 1 so you can solve another voltage, current or resistance value.

Screen 1 keeps the main controls visible. Screen 2 keeps the answer and working clear.

Use PREV and NEXT on every internal screen to move through the help pages safely.