A galvanometer of resistance 22 . 8 Ω measures 1 A . How much shunt should be used, so that it can be used to measure 20 A ?

Question

A galvanometer of resistance 22 . 8 Ω measures 1 A . How much shunt should be used, so that it can be used to measure 20 A ?, 1 Ω, 2 Ω, 1.2 Ω, 2.2 Ω

MARKS App · Accepted Answer

Shunt is a low resistance used in parallel with the galvanometer to make it ammeter. The voltage across galvanometer = voltage across the shunt Given, G = 22.8 Ω , i = 20 A , i G = 1 A ∴ S = 1 × 22 .8 20 − 1 = 22 .8 19 = 1 .2 Ω

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