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When a voltage measuring device is conne...

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

A

input voltage can not be AC voltage, but a DC voltage

B

maximum input voltage is 220 V

C

the meter reads no `upsilon` but `lt upsilon^(2)gt` and is calibrated to read `sqrt(lt upsilon^(2)gt)`

D

the pointer of meter is stuck by some mechanical defect

Text Solution

Verified by Experts

The correct Answer is:
C
The volmeter connected to A.C. mains is calibrated to read root mean square value or virtual value of a.c. voltage, i.e., `sqrt(lt upsilon^(2) gt)`. Choice ( c) is correct.
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