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InterviewSolution
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A microameter has a resistance of `100 omega` and a full scale range of ` 50 muA`. It can be used as a voltmeter or as a higher range ammeter provides a resistance is added to it . Pick the correct range and resistance combination(s)A. `50V` range with `10kOmega` resistance in seriesB. `10V` range with `200kOmega` resistance in seriesC. `5mA` range with `1Omega` resistance in parallelD. `10mA` range with `1Omega` resistance in parallel |
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Answer» Correct Answer - B::C Here, `G=100Omega`, `I_g=50xx10^-6A=5xx10^-5A` For a voltmeter of range `50V`, `R=(50)/(5xx10^-5)-100=10^6-10^2=9*999xx10^5Omega` For a voltmeter of range `10V`, `R=(10)/(5xx10^-5)-100=199,900Omega` `~~200kOmega` in series For an ammeter of range `5mA`, `S=(5xx10^-5xx100)/(5xx10^-3-5xx10^-5)~~1Omega` in parallel For an ammeter of range `10mA` `S=(5xx10^-5xx100)/(10xx10^-3-5xx10^-5)=0*5Omega` in parallel |
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