A student is provided with the voltmeters of following specification to use in an experiment for verifying Ohm's law . Which one should be selected and why ?
Voltmeter V1 : least count = 0.5V
Range = 0-5 V
Voltmeter V2 : least count = 0.05V
Range = 0-10V
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The student should use Voltmeter V2 having least count = 0.05V and Range = 0-10V, because it has high range and low least count. so the full scale error percentage will be less in voltmeter V2.
error % in V2 in full scale = 0.05/10 x 100 = 0.5%
error % in V1 in full scale = 0.5/5 x 100 = 10 %
Hence the student should use voltmeter V2.
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