PURPOSE: Demonstrate a transistor circuit.

DESCRIPTION: 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 light and that the heavy duty dry cell connected directly to the light turns the light on.

SUGGESTIONS: A transparency of the circuit is part of the demonstration.

REFERENCES: (PIRA 5M10.90)

EQUIPMENT: Mounted transistor circuit, including car headlamp, with heavy-duty dry cells.

SETUP TIME: None.