Concept explainers
To identify: The device obtained by connecting a resistor in shunt with a galvanometer.
Answer to Problem 57A
The device obtained by connecting a resistor in shunt with galvanometer is an ammeter.
Explanation of Solution
Given:
A galvanometer with a resistor connected in parallel to it.
Consider the circuit shown in Figure 1. The circuit consists of a galvanometer which can be used to measure small currents. The resistor connected in parallel with the galvanometer is called as “shunt resistor”. This resistor has a value less than the resistance of the galvanometer. It is converted to an ammeter using circuit.
Figure 1
In this circuit, the effective resistance of the coil of the galvanometer is reduced from its original value of around 1000 Ω to a lower value decided by the shunt resistance across the meter. Due to the presence of shunt resistance, more current flows through the shunt resistor than the galvanometer. This produces a corresponding deflection in the meter scale and hence measures the current.
Thus, by connecting a resistor in shunt with the galvanometer, it can be made to work as an ammeter.
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Glencoe Physics: Principles and Problems, Student Edition
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