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A shunt-type ohmmeter uses a 2 mA basic d'Arsonval movement with an internal resistance of 25...

A shunt-type ohmmeter uses a 2 mA basic d'Arsonval movement with an internal resistance of 25 Ω. The battery emf is 1.5 V. 


Calculate:-

 (a) Value of the resistor in series with the battery to adjust the Full Scale Deflection (FSD) 

 (b) At what point (percentage) of full-scale will 100 Q be marked on the scale?

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Rx = unknown resistance R1 = scale adjusting resistance E = omf of intemal battery Rm= PMMC meter resistance S = switch EI

Solutions

Expert Solution

When resistance taken infinite in first bit,by making it open ckt ,I applied kvl in first loop which passes same current I1 through R1 and meter.


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