Institute of ImaginationRobot LabRobot Lab

Introduction

How it works

Electricity flows from the battery along the + strip, through both LEDs and back along the − strip. Each LED bridges the two strips on its own, so the two eyes share the battery. This is called parallel. The binder clip is the switch: it presses the flap onto the battery to close the gap, and taking it off opens the gap again.

The front of the finished circuit with the flap clipped shut and both LED eyes lit. Red arrows show the electricity going from the battery down the plus strip, through each LED, along the minus strip and back up to the battery.