Question
Download Solution PDFWhich of the following is true for extending the range of the DC voltmeter?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExtension of moving iron voltmeter
The range of a moving iron voltmeter can be extended by using a high value of multiplier resistance connected in series with a voltmeter.
\(R_{se}=R_m({V\over V_g}-1)\)
Additional Information
Extension of moving iron ammeter
The range of a moving iron ammeter can be extended by using a low value of shunt resistance connected in parallel with an ammeter.
\(R_{sh}(I-I_m)=R_mI_m\)
\(R_{sh}={R_mI_m\over (I-I_m)}\)
\(R_{sh}={R_m\over ({I\over I_m}-1)}\)
\(R_{sh}={R_m\over ({m}-1)}\)
Last updated on May 29, 2025
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