A relatively simple experimental apparatus that uses an ac voltmeter to demonstrate the undefined nature of voltage when is described. This apparatus is suitable for a lecture demonstration in introductory physics courses. Voltmeter readings obtained in different experimental circumstances are also briefly discussed.
REFERENCES
1.
A case similar to this is also discussed in detail in a paper by Robert Romer:
R.
Romer
, “What do ‘voltmeters’ measure?: Faraday’s law in a multiply connected region
,” Am. J. Phys.
50
, 1089
–1093
(1982
).© 2005 American Association of Physics Teachers.
2005
American Association of Physics Teachers
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