SATHEE: alternating-currents Question 3

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Question: Q. 3. When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of $220 V$ . this means

(a) Input voltage cannot be AC voltage, but a DC voltage.

(b) Maximum input voltage is $220 V$ .

(d) The pointer of the meter is stuck by some mechanical defect.

[NCERT Exemplar]

Show Answer

Solution:

Ans. Correct option : (c)

Explanation: The voltmeter in AC circuit reads value $⟨ V^{2} ⟩$ and meter is calibrated to rms value $⟨ V^{2} ⟩$ which is multiplied by $\sqrt{2}$ to get $V_{r m s}$ . In other words, voltmeter connected to the $AC$ main read root mean square value of $AC$ voltage, i.e., $\sqrt{⟨ V^{2} ⟩}$ .

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