Question
Download Solution PDFA galvanometer coil has a resistance of 14 Ω and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into a voltmeter of range 0 to 16 V?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Galvanometer coil resistance (Rg)= 14 Ω
Full scale deflection current (ig) = 4 mA or (0.004 A)
Voltmeter range (V) = 16 V
Concept:
For converting a galvanometer into a voltmeter, we connect a high resistance in series with the galvanometer coil.
The voltmeter is then connected in parallel across the terminals for which potential difference is to be measured.
Formula:
ig(R + Rg) = V
⇒ R = V/ig - Rg
Calculation:
R = (16/0.004 - 14)
⇒ R = 4000 - 14
= 3986 Ω
Last updated on Jun 17, 2025
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