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The scale of a galvanometer is divided into 150 equal divisions. The galvanometer has the current sensitivity of 10 divisions per mA and the voltage sensitivity of 2 divisions per m V. How the galvanometer be designed to read (i) 6A, per division and (ii) 1 V, per division? |
Answer» Solution :The resistance of galvanometer,  `G=("Full scale votage")/("Full scale current")=(75xx10^(-3))/(15xx10^(-3))=5OMEGA` For CONVERSION into ammeter of range I AMP. `(I-I_(g))S=I_(g)G` `thereforeS=(I_(g)G)/(I-I_(g))=(15xx10^(-3)xx5)/((150xx6-15xx10^(-3)))=(15xx10^(-3)xx5)/(150xx6)` `8.3xx10^(-5)` ohm For conversion into voltmeter of range V volt, `I_(g)(G+R)=V` `thereforeR=V/(I_(g))-G=150/(15xx10^(-3))-5-9995` ohm |
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