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Voltmeter-Ammeter Method

9.1. Voltmeter-Ammeter Method. Fig. 31 (a) and (b) shows two methods of connections for measurement of resistance. 22

Fig. 31. Methods for measuring resistance.

 

Let  Ra = resistance of the ammeter (which is very small),

 

Rv = resistance of the voltmeter (which is a large value),

 

R = resistance to be measured,

 

V = reading of the voltmeter, and

 

I = reading of the ammeter.

 

Fig. 31 (a) shows the connections for measurement of low resistances.

 

Here   1= Iv + Ir23

Fig. 31 (b) shows the connections for measurement of high and low resistances.

Here   V = IRa + IR

IR=V-IRa24