Circuit Lab

Level1 / 8

Goals0 / 1

Light the bulb

Electricity only flows round a loop. Join the battery to the bulb with wires — out of one end, through the bulb, and back in the other — and watch it glow!

How to play

🧰
Drag parts from the box at the bottom onto the bench. Drag one back into the box to put it away.
🔌
Make a wire by dragging from one metal dot to another — or tap one dot, then the other.
✂️
Tap a wire to snip it off.
👆
Tap a switch to turn it on and off.
🔁
Make a loop. Electricity flows out of the battery, through your parts, and back in. The moving dots show where it goes.
⭐
Eight levels, more parts each time — switches, two bulbs, a fan, a resistor, an LED, two batteries, and a free build at the end.

What this grows

How a circuit really works: electricity needs a whole loop, a switch is a gap you can open and close, parts in a line share the push while parts side by side each get it all, a resistor holds the flow back, and an LED only lets electricity through one way — gently, through a resistor.

Electric circuitsSwitches & resistorsSeries & parallel

For grown-ups

Wire batteries, bulbs, motors, switches, resistors and LEDs into real working circuits, one new part a level.

Ages: 6+
A sitting: About 10 min
Practises: Electric circuits, Switches & resistors, Series & parallel
Plays on: Phone, tablet or laptop — in the browser
Costs: Nothing. No sign-up, no ads

Circuit Lab: wire it up and make it glow

Circuit Lab