Voltmeter-Ammeter method

Voltmeter-Ammeter method for measurement of medium resistance

In the figure let us assume the voltmeter to be ideal (internal resistance Rin=infinite). So current Iv=0A I= IA+IV I=IA       [IV=0A] V=VA+VK V=I×RA+I×Runknown Ammeter is  not ideal here. V=I(RA+ Runknown) V/I= RA+ Runknown            [V/I= Measured value of resistance] RM=RA+ Runknown So the measured value of resistance is greater than the Read more…