Ohm's Law

Purpose

To demonstrate V=IR.
 

Equipment

Ohm's law demonstrator, overhead projector.

 

Images

k5-31

Description

This setup, including variable voltage power supply, voltmeter, ammeter, and plug for resistor, sits on an overhead projector; the circuit is clearly visible. Changing the voltage produces an appropriate change of current. Several resistors can be used.
 

References

Steven A. Waltner and Thomas A. Lehman, When is Ohm's Law Valid?, TPT 31, 102-103 (1993). ◙J. D. Jackson, Surface charges on circuit wires and resistors play three roles, AJP 64, 855-870 (1996).