An ammeter has a resistance of 50 Ω and a full scale deflection current of 50 μA. It can be used as a voltmeter or as a higher range ammeter provided that a resistance isadded to it. Choose the correct range and resistance combination from the following
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a
20 V range with approximately 400 kΩ resistance in series
b
100 V range with approximately 2 × 106Ω resistance in series
c
1 mA range with 50Ω resistance in parallel
d
0.1 mA range with 50Ω resistance in parallel
answer is A.
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Detailed Solution
For ammeter,i=imaxRs+RARs⇒i=0.1mA for Rs=50Ω [as RA=50Ω and imax=50μA ] For voltmeter,V=imaxRA+RV⇒ V≈10V for Rv=200kΩ