🔌 Simple circuit builder
Does it light? Pick a part, put it in the loop, and see whether the electricity can get all the way round. Every try tells you why.
Wiring up the battery…
A circuit is a path for electricity. It has to go from one end of the battery, all the way round, and back to the other end. If there is a gap anywhere, or a switch is open, it stops and nothing happens. A bulb glows and a buzzer buzzes when the electricity flows through them.
This builder is a drawing, so nothing here can shock you, and nothing you do is saved or sent. To try it for real, ask a grown-up for a small battery, a little bulb and some wire. Never put wires into a wall socket.
Want a project? Try the science fair project picker.