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Question
In conversion of moving coil galvanometer into an ammeter of required range, the resistance of ammeter, so formed is ______.
[S = shunt and G = resistance of galvanometer]
Options
`("S + G")/"SG"`
`"SG"/("S + G")`
`("S - G")/"SG"`
`"SG"/("S - G")`
MCQ
Fill in the Blanks
Solution
In conversion of moving coil galvanometer into an ammeter of required range, the resistance of ammeter, so formed is `underline("SG"/("S + G"))`.
Explanation:
A moving coil galvanometer can be converted into an ammeter by connecting a low resistance (called shunt resistance) in parallel to it.
Hence, the resistance (R) of the ammeter, so formed is
`1/"R" = 1/"S" + 1/"G"`
R = `"SG"/("S + G")`
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