Free Physics Simulation

Explore the Ohm's Law Simulator

Change voltage and resistance and see the current, the V = I R equation letters and a bulb brightness change. Free, no signup, runs in your browser.

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Free to use
No signup
Nothing to install
Runs in your browser

Free to use

No signup

Ohm's Law Simulator

Setting

Open the Ohm's Law Simulator

Illustration. Open the tool for the real thing.

See it in action

The Ohm's Law Simulator with sample data entered and the result showing.

Explained

What is the Ohm's Law Simulator?

Change voltage and resistance and see the current, the V = I R equation letters and a bulb brightness change. It runs in your browser, so a change to a setting or a drag on an object shows up at once.

All electronic devices are designed with Ohm's law: it sets the resistor in every LED light, charger and radio.

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Key idea 1Key idea 2Key idea 3

3 steps to your result

Open the tool and follow along. Nothing to install.

In the Ohm's Law Simulator (V = IR), use the controls to change Voltage, Resistance. The simulation reacts instantly.

Start with this experiment: Double the voltage and read the current. Drag any glowing handle, object or slider with your mouse or finger and the Ohm's Law Simulator (V = IR) responds in real time.

Change one setting at a time and watch which readout moves, then compare it with this idea: V = I × R, so I = V ÷ R.

What you get

Key idea 1

V = I × R, so I = V ÷ R.

Key idea 2

Doubling the voltage doubles the current.

Key idea 3

Doubling the resistance halves the current.

Experiment 1

Double the voltage and read the current.

Experiment 2

Double the resistance and see what happens.

Experiment 3

Find a setting that makes the bulb very bright.

Used for

Pick one to see how it fits.

Use case

Physics learners

Physics students in middle school, high school and first-year university, teachers who want a quick demonstration for the projector, and anyone revising for exams.

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How it compares

A plain look at this tool next to the usual alternative.

	This simulation	Textbook diagram
Interactive	Drag, tap and change settings	Fixed picture
Install	Nothing to install	Not needed
Cost	Free to use	Depends on the book

Questions people ask

What is Ohm's law?

The current through a resistor is proportional to the voltage across it: V = IR.

How do I find current?

Divide the voltage by the resistance.

Is the Ohm's Law Simulator (V = IR) free to use?

Yes. The Ohm's Law Simulator (V = IR) is free, needs no signup or download and runs in your web browser. It is part of the Physics group of AZRS simulations.

Does the Ohm's Law Simulator (V = IR) work on a phone or tablet?

Yes. The Ohm's Law Simulator (V = IR) takes touch input as well as mouse input, so you can use its 2 adjustable settings with a finger. A larger screen makes the controls and graphs easier to read.

How do I use the Ohm's Law Simulator?

1. In the Ohm's Law Simulator (V = IR), use the controls to change Voltage, Resistance. The simulation reacts instantly. 2. In the Ohm's Law Simulator (V = IR), pick an option such as Numbers, Hide numbers to switch modes or load an example. 3. Start with this experiment: Double the voltage and read the current. Drag any glowing handle, object or slider with your mouse or finger and the Ohm's Law Simulator (V = IR) responds in real time. 4. Change one setting at a time and watch which readout moves, then compare it with this idea: V = I × R, so I = V ÷ R.