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To enhance the sensitivity, an Ammeter is to be designed with two kinds of graduation on its scale — 0 to 10 A and 0 to 1 A. for that a galvanometer of resistance 50 Omega and full scale deflection current 1 mA was used along with two resistances R_(1) and R_(2) as shown. Either of T_(1) or T_(2) is to be used as negative terminal of the Ammeter. (a) When measuring a current of the order of 0.1 A, which shall be used as negative terminal — T_(1) or T_(2) ? (b) find the values of R_(1) and R_(2). |
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Answer» (b) `R_(1)=(5)/(999)Omega` `R_(2)=(5)/(111)Omega` |
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