How to Use the Ohm's Law Calculator

A step-by-step guide to using the Ohm's Law interactive visualizer.

Step-by-Step Guide

1. 1

   Set the current I (how many amperes flow through the circuit) using the slider.

2. 2

   Set the resistance R of the resistor using its slider — the resistor symbol glows more intensely with higher resistance.

3. 3

   The circuit diagram animates current-dot speed proportional to I.

4. 4

   Read the voltage V = IR from the result panel. Power P = IV is also calculated.

5. 5

   Use the Share button to encode your circuit values into the URL for sharing.

Formula Explanation

Think of electricity like water in a pipe — voltage is the water pressure, current is how fast the water flows, and resistance is how narrow the pipe is. Increase pressure or widen the pipe and more water flows.

Real-World Applications

• → Electricians size wires and fuses using Ohm's Law to prevent overheating and fires.
• → PCB designers route traces with specific widths to manage current without excessive voltage drop.
• → Battery engineers calculate internal resistance to maximise energy delivery efficiency.