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تسجيل

The Unit of Current the Ampere

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-354

2025-12-28

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The chemical, the magnetic, or the heating effect may be taken as a basis for measurement of currents. The chemical effect, however, is taken to define the unit, and the magnetic effect for practical use.

The ampere is that current that will deposit 0.001118 g. (0.01725 grain) of silver per second from a solution of silver nitrate. The same current will deposit 0.00032959 g. (0.005086 grain) of copper per second from a solution of copper sulphate .

For the measurement of small currents the milliampere, or thousandth part of an ampere, is used as a unit.