Measurement (didn't understand solution)

[jaus tail]

Homework Statement

Homework Equations

For sine wave RMS/Avg = 1.11
For DC, RMS = Avg = Peak Value

The Attempt at a Solution

I didn't understand the solution. There is a 24V DC supply. I give it to an AV Voltmeter. The Voltmeter responds to average value. So the voltmeter would give 24V DC. So Answer should be A. I know that RMS / Avg = 1.11 for sine wave. But I didn't understand what they've said in solution.

Can somebody help me out?

 

[DrClaude]

The voltmeter measures the average voltage, and since it is an AC voltmeter, it reports the RMS by multiplying the average by 1.11. Since it is sampling a DC signal, it gets an average of 24 V, but still assumes it is AC and applies the same multiplication factor.