Step 8

Attach the alligator clip with negative current (in the Play-Doh mound with the black wire sticking in) to the shortest leg of your LED. Your LED should light up!

If your LED doesn’t light up, make sure that the cables are fully in the play-doh and that the alligator clips are holding on to the LED legs tightly. You should also double check that you have your clips connected to the right LED leg (positive or negative).

Now that the circuit works, let’s start testing the conductivity of other materials!