Demonstrate a transistor circuit.
Mounted transistor circuit, including car headlamp, with heavy-duty dry cells.
A transparency of the circuit is part of the demonstration.
A high-current transistor controlled by a flashlight battery operates an automobile headlamp by switching a 7.5volt heavy duty dry cell onto the light. The circuit for the system is shown below, and is included with the demonstration. By removing and replacing wires it can be shown that the flashlight battery alone cannot operate the lights and that the heavy duty dry cell connected directly to the light turn the light on.
Novel Experiments in Physics: Amplification, University of California, Berkeley, 1963. ◙A. Sconza, G. Torzo, and G. Viola, Experiment on the physics of the PN junction, AJP 62, 66-70 (1994).