A galvanometer may be converted into an ammet | vedclass

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(D) To convert a galvanometer into an ammeter,a very small resistance (shunt) is connected in parallel. Thus,the resistance of an ammeter is very low.

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$A$ voltmeter of range $10 \, V$

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(D) To convert a galvanometer into an ammeter,a very small resistance (shunt) is connected in parallel. Thus,the resistance of an ammeter is very low.To convert a galvanometer into a voltmeter,a very large resistance is connected in series. Thus,the resistance of a voltmeter is very high.For a voltmeter,the resistance $R$ is given by $R = (V / I_g) - G$,where $V$ is the range,$I_g$ is the full-scale deflection current $(1 \, mA)$,and $G$ is the galvanometer resistance.Since $R$ is directly proportional to the voltage range $V$,the voltmeter with the highest range will have the largest resistance.Comparing the two voltmeters ($5 \, V$ and $10 \, V$),the voltmeter with a range of $10 \, V$ will have the largest resistance.

$A$ galvanometer may be converted into an ammeter or a voltmeter. In which of the following cases will the resistance of the device be the largest? (Assume the maximum range of the galvanometer is $1 \, mA$)

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