Question
Download Solution PDFA 250 V moving iron voltmeter takes a current of 0.05 A when connected to a 250 V DC supply. The coil has an inductance of 1 H. What will be the reading on the meter when connected to a 250 V, 100 Hz supply? Assume impedance at 100 Hz to be 6000 Ω.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The voltage reading of a moving iron voltmeter corresponds to the true RMS voltage across its resistance:
Vmeter = IAC × R
where, IAC = AC current
R = DC resistance
Calculation
Given, VDC = 250 V
IDC = 0.05 A
L = 1 H
f = 100 Hz
Impedance at 100Hz, ZAC = 6000 Ω
ZAC = 5040 Ω
Vmeter = (0.04167) × (5000)
Vmeter = 208.33 V
Last updated on May 29, 2025
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