Toilet paper tube light bulb

Materials

• Electrical tape
• Eight D batteries
• 0.7 mm Pencil Lead
• Mason jar
• Two wires with alligator clips
• Toilet paper roll

Instructions

STEP 1: Use the electrical tape to secure all of the batteries together in a series.

STEP 2: Use the electrical tape to secure the alligator clips to the sides of the toilet paper roll.

STEP 3: Place a 0.7 mm piece of pencil lead between the alligator clips at the top of the toilet paper roll.

STEP 4: Place the jar over the toilet paper roll, alligator clips and pencil lead.

STEP 5: Close the circuit by touching the ends of the alligator clips to the ends of the roll of batteries.

Explanation

The electrons from the battery flow through the alligator clips and pencil lead, creating a closed circuit. The pencil lead or filament becomes so hot it glows, becomes weak and eventually breaks.