Electricity · Physics

Ohm's Law & Resistance Simulation

Change voltage and resistance and watch the current — and the letters of V = IR — grow and shrink. Then stretch and thicken a wire to see R = ρL/A.

Interactive virtual lab · no download · works on phones and laptops

Chapter: Current Electricity
For: Class 10 · Class 12 · NEET
Time: ~8 min

Ohm's Law & Resistance is a Pro simulation

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How to use it

1Ohm's law: drag the voltage and resistance sliders.
2Resistance in a wire: change ρ, length and area.
3Watch the equation letters resize to match.

What to notice

At fixed R, current is proportional to voltage.
At fixed V, doubling R halves the current.
A longer wire has more resistance; a thicker one has less.
Resistivity ρ is a property of the material, not of the wire's shape.

For teachers

A ready-made teaching kit comes with this lab

Lesson plan
18 min, 4 steps
Ask the class
3 questions with answers
Quick quiz
6 questions, printable
Key formulas
3 formulas

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About the Ohm's Law & Resistance simulation

Ohm's law says the current through a conductor is proportional to the voltage across it, as long as its temperature stays the same: V = IR. The resistance R itself depends on the wire — longer wires resist more, thicker wires less, and some materials far more than others. That property of the material is its resistivity ρ.

In this Ohm's law simulation the letters of V = IR and R = ρL/A grow and shrink as you change the voltage, resistance, length, area and resistivity, so you can see which way each quantity pulls. It covers Electricity in Class 10 and Current Electricity in Class 12 and NEET.

Also covers: v = ir, resistance in a wire, resistivity, current, voltage, r = rho l / a.