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Asked in AIPMT 2004 · Conversion to ammeter and voltmeter
Idea: a voltmeter goes across the part of the circuit being measured, so it must draw as little current as possible or it changes what it is measuring.
Drawing little current means the instrument must have a large resistance.
The galvanometer's own coil resistance is small, so resistance has to be added.
Adding in parallel always lowers the combined resistance, so that is the wrong connection.
Adding in series raises it, and also shares out the potential so that only the small full-scale current reaches the coil.
So: a high resistance in series.
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