"एम्पियर": अवतरणों में अंतर
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<br /><!-- Because it is a base unit, the definition of the ampere is not tied to any other electrical unit. The definition for the ampere is equivalent to fixing a value of the [[Permeability (electromagnetism)|permeability]] of vacuum to ''μ''<sub>0</sub> = 4π×10<sup>−7</sup> H/m. Prior to 1948, the so-called "international ampere" was used, defined in terms of the [[electrolysis|electrolytic]] deposition rate of [[silver]].<ref>Robert B. Northrop, ''Introduction to Instrumentation and Measurements'', CRC Press, 1997 [http://books.google.com/books?vid=ISBN0849378982&id=mcpcfpQfxB4C&pg=PA21&lpg=PA21&ots=ZTUUMNAShz&dq=ampere+1948+electrolytic++silver+international&sig=1Xv1-zsZ1pNuQuFjRzlhJaCWXiY online]</ref> The older unit is equal to 0.999 85 A.
The ampere is most accurately realized using a [[watt balance]], but is in practice maintained via [[Ohm's Law]] from the units of [[EMF]] and [[electrical resistance|resistance]], the [[volt]] and the [[Ohm (unit)|ohm]], since the latter two can be tied to physical phenomena that are relatively easy to reproduce, the [[Josephson junction]] and the [[quantum Hall effect]], respectively.
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