Question

When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220 V.
This means:

• A. the meter reads not $v$ but $v^2$ and is calibrated to read $\sqrt{v^2}$
• B. maximum input voltage is 220 V.
• C. input voltage cannot be AC voltage, but a DC voltage.
• D. the pointer of the meter is stuck by some mechanical defect.

Answer 1

The correct option is A the meter reads not $v$ but $v^2$ and is calibrated to read $\sqrt{v^2}$

The voltmeter connected to the AC main reads root mean square value of AC voltage, i.e., $\sqrt{v^2}$.

Final Answer: Option (c)