MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Electrical conduction experiment. Electrical circuit consisting of batteries (upper left), a light bulb (right), a pencil (lower left), and connecting wires. The lit bulb demonstrates that graphite (the 'lead' of the pencil) conducts electricity. Graphite is a specific form (allotrope) of carbon where the structure allows electrons to flow.
Model release not required. Property release not required.