Concept
Version 8
Created by Boundless
Null Measurements
Voltmeter Connected to Battery
An analog voltmeter attached to a battery draws a small but nonzero current and measures a terminal voltage that differs from the EMF of the battery. (Note that the script capital E symbolizes electromotive force, or EMF. ) Since the internal resistance of the battery is not known precisely, it is not possible to calculate the EMF precisely.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, College Physics. October 26, 2012."
http://cnx.org/content/m42362/latest/?collection=col11406/latest
OpenStax CNX
CC BY 3.0.