Chapter 24, Problem 64A

To determine

To identify: The device represented by the given circuit.

Answer to Problem 64A

The device obtained by the given circuit is a voltmeter.

Explanation of Solution

Given:

A galvanometer with a resistor connected in series to it.

Consider the circuit shown in Figure 1. The circuit consists of a galvanometer which can be used to measure small currents. A resistor called multiplier is connected in series with the galvanometer and it is converted to a “voltmeter” using circuit.

  

Figure 1

In this circuit, the galvanometer measures the current through the resistor and this can be used to obtain the voltage across it using Ohm’s law as,

  $V=IR$

Hence, it works as a voltmeter.