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Asked in CBSE PMT 1992 · Conversion to ammeter and voltmeter
Idea: an ammeter is put in the circuit, so it must have as little resistance as possible or it changes the current it is measuring.
It must also let most of the current bypass the delicate coil.
Both are achieved by a shunt — a small resistance in parallel with the galvanometer.
In parallel, the combined resistance is lower than either branch, keeping the meter's resistance small.
And being the easier path, the shunt carries most of the current, with only the small full-scale current left for the coil.
So: a low resistance in parallel.
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