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To transform a galvanometer into an ammeter, a shunt is connected in parallel to it. The value of the shunt is determined by which formula?

1. S = G / (n - 1)
2. G represents the galvanometer's resistance
3. S is much smaller than G, so S = 0.001Ω
4. The equivalent resistance GS / (G + S) equals 0.001Ω

Correct answer: S = G / (n - 1)

Solution

To convert a galvanometer into an ammeter, a low resistance shunt (S) is connected in parallel with the galvanometer. The formula for the shunt resistance is S = G / (n - 1), where G is the resistance of the galvanometer and n is the ratio of the total current to the galvanometer current.

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