Make a Pencil's Lead Potentiometer (Experimentations)

Step 4 Testing With LED - Assembly

You can also test the Variable Resistor with an LED. Here is how to do it: First connect your 2 alligator clips to the 9V (one on each pole), then connect the Negative clip to the negative lead of the LED, and finally, bend the positive lead of the LED(Anode, the longest) so its easy to move on the paper and it gives good contact. ( If you don't have any alligator clips, you can replace them by normal wire, simply twist around the components to make the contact, or solder ) *Tips : If you don't know witch lead of the LED is - or + , test out with a button cell !