SSC JE Electrical Engineering 2014 Set 2 Paper

Question : 106 of 200

Marks: +1, -0

A d.c. voltmeter has a sensitivity of 1000 Ω/watt.
When it measure half full scale in 100 V range, the current through the voltmeter will be :

Solution:

Sensitivity of Voltmeter =

{\Full \scale \deflection \of \voltmeter}/{\Current \Passing \through \voltmeter}

For 1 volt Resistance is 1000Ω as given in question.
For 100 Volt Resistance

= 1000 × 100 Ω

Full current in the Meter =

100/{1000× 100 =}= 1 mA

And therefore half full scale =

1/2×1mA=0.5

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