Voltage & Ohm’s Law

Push, flow and resistance

An interactive lesson with 7 steps, about 6 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Voltage is energy per charge (1 V = 1 J/C). It pushes current around the circuit.
• Ohm's law: $V = IR$, with resistance in ohms (Ω).
• Current flows only where there is a voltage difference.

Steps

1. Push and resist
2. Voltage
3. Ohm’s law
4. Find the current
5. Set the current
6. Find the resistance
7. Why birds don’t get shocked