Semiconductor Model

Purpose

Model of semiconductor.
 

Equipment

Electric current board and nail model with timer.

 

Images

k5-45

Description

About 100 nails are driven randomly into a board. The drift velocity is proportional to the square root of the field, so that only a modified "Ohm's law" applies. In this case, the apparatus simulates the motion of charge carriers in semiconductors under the action of an electric field. The field is increased by changing the tilt of the board.
 

References

Meiners, Physics Demonstrations Expts., 40-1.1 Charge Motion Demonstrator, 1220.