The Resistance of a Cell
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-390
2025-12-11
16
may be found by measuring its E. M. F. with a high-resistance voltmeter, and then measuring the current it will send through an ammeter, the resistance of which is known. Ohm's Law may E be written in the form 
, in which R is the external resistance and r the internal resistance from this, 
For example, if the voltmeter reads 1.1 volts, the ammeter 0.4 ampere, and the resistance of the ammeter is 0.1 ohm, we have 
In practice the resistance of the ammeter is often assumed to be zero, and the internal resistance is taken as.
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