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Article: A closer look at voltage drop
- Article from:
- Electrical Apparatus
- Article date:
- November 1, 2007
- Author:
CopyrightCopyright Barks Publications Nov 2007. Provided by ProQuest LLC. (Hide copyright information)
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Customary ways of looking at the resistance found in conductors don't tell the whole story
OHM'S LAW: SIMPLE, FUNDAmental, and well-known to those involved in electrical work. German physicist Georg Simon Ohm came up with the relationship in 1827. Once the ohm was defined (35 years later) as the unit of resistance, the equation we know today was written as E=IR, or volts=amperes times ohms. Given any two of the three quantities, we can easily solve for the third.
One of the more common applications of Ohm's Law is the calculation of voltage drop between a voltage source and connected load. Unless we're dealing with the rare superconductor, some resistance is unavoidably present in any ...