defence exam SSB Head Constable (Communication) 2023 Mock Test Physics Electromagnetic Oscillations and Alternating Current Alternating Current
When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220 V. This means
1
input voltage cannot be AC voltage, but a DC voltage.
2
maximum input voltage is 220 V.
3
the meter reads not v but 2> and is calibrated to read \(\sqrt{.}\)
4
the pointer of the meter is stuck by some mechanical defect.