A D.C. supply of 120 volt is connected to a large resistance X. A volt meter of resistance 10 kW, placed in series in the circuit reads 4 volts. What is the value of X? What do you think is the purpose in using a voltmeter, instead of an ammeter, to determine the large resistance X?
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290 k Ω Ω , Due to very small value of current, Ammeter has not been used. The ammeter reading would have been very small. Note that this is unusual use of a voltmeter. It is meant only for the measurement of high resistance.
Sol. 4 = i × 10 × 10 3 .
i = 
= 
X + 10 4 = 30 × 10 4
X = 29 × 10 4
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