A galvanometer with an internal resistance of 7 ohms is connected in parallel to an unknown resistor R together with a shunt resistor of 4 ohms. A constant current I goes through and the galvanometer deflects to a certain amount. The resistor R is then taken away and repositioned in series with the galvanometer, leaving the shunt in parallel with this series combination. With the same current I, the galvanometer deflection remains the same. Calculate the value R of the unknown resistor R

A galvanometer with an internal resistance of 7 ohms is connected in parallel to an unknown resistor R together with a shunt resistor of 4 ohms. A constant current I goes through and the galvanometer deflects to a certain amount. The resistor R is then taken away and repositioned in series with the galvanometer, leaving the shunt in parallel with this series combination. With the same current I, the galvanometer deflection remains the same. Calculate the value R of the unknown resistor R

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter9: Measuring Instruments

Section: Chapter Questions

Problem 5RQ: 5. Name two methods used to make a DC multirange ammeter.

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