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How can a galvanometer be converted into...

How can a galvanometer be converted into an ammeter?

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An ammeter is a low resistance galvanometer with is used to measure the current in a circuit in ampere.
between points A and B.
Let I = Total current flowing through the circuit
`I - I _(g) = ` Current flowing through .S.
Where `I _(g) =` Current flowing through G
V = potential difference betwen A and B.
Across, `GV = I _(g) G " "...(i)`
Across, `SV = (I - I _(g)) S " "...(i)`

from (i) and (ii), we have
`(I _(s) - _(g)) S = I _(g) G implies S = (I _(g))/( I - I _(g)) . G`
Thus , the value of shunt resistance S can be calculaed. If this shunt resistance i commected in parallel with galvanometer, then the galvanometer is converted into ammeter of range `0- I` ampere.
Total effective resistance `R _(P)` of the ammeter is given by
`(1)/( R _(P)) = (1)/(G) + (1)/(S) implies R _(P) = (GS)/( G+S)`
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