The Volt - Ohm - Milliammeter

R = E /1 = 10 / 0.001 = 10,000 ohms

Allowing for internal resistance of the meter movement (roughly 1000 ohms), the formula indicates that Rz must be adjustable within the range of 9K ohms. Thus, any additional resistance introduced into the circuit will impede current flow even more and result in less than full deflection of the meter. Hence, what is basically a current indication reflects resistance values on the ohms scale.





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