1.

A pointergalvanometerwitha scaleof 30divisionshas aresistanceof 12Omegafullscaledeflectionis obtained fora currentof 3mA .Calculatethe currentsensitivityof thegalvanometer.Howwill youconvert thisgalvanometerintoavoltageof range0 to18 V ?

Answer»

Solution :GIVEN`: theta= 30 ,G = 12 Omega,I =3 mA,V=18V,S_1 =? ,R=?`
CURRENT sensitivity `S_1 =theta/1 = (30 )/(3 XX 10^(-3))`
` S_I = 10 xx 10^3 `
`S_I =10^4d I v //A `
`R=(V)/(I_g) -G `
`= ( 18)/( 3 xx 10^(-3) ) -12`
`R=600-12 = 5988Omega `
Byconnecting`R=5988Omega `in serieswith THEGALVANOMETER .


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