When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of \(220~\text{V}\). This means:

1. input voltage cannot be AC voltage, but a DC voltage
2. maximum input voltage is \(220~\text{V}\)
3. the meter reads not v but  \(<v^2>\)  and is calibrated to read  \(\sqrt{<v^2>}\)
4. the pointer of the meter is stuck by some mechanical defect

Subtopic:  RMS & Average Values |
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