So first , What is a Potentiometer?
Its not very complicated, to make it short, it's a kind of resistors ( Limit the current flow) but its adjustable, so you can raise or lower the limit of the current flow.
I recently seen a video of MAKE Magazine (MAKE : Present The Resistor) on Youtube in witch they were doing something similar to this and thats where I got the idea to make an Instructables about how to make this simple Variable Resistor.So I have no credit for the idea, I just did an Instructables, to share it with you!
The Idea is to draw a band (with a Graphite pencil) on a sheet of paper ,the band of graphite will act as the Variable Resistor (Potentiometer) because the graphite conduct electricity but poorly.
Step 1: Material
- Sheet of paper
- Pencil [You need a very soft one like 2B+ (Less may not work properly)]
- an LED
- Alligator clips (2)
- Source of power (9v battery is good)
Step 2: Draw the Variable Resistor
Step 3: Testing With the Multi-Meter
Step 4: Testing With LED - Assembly
Step 5: Testing With LED - the Test
Step 6: Experiments!
Hope you enjoy !