Effective and mean voltage

A voltage divider consisting of resistors R1 = 103000 Ω and R2 = 197000 Ω is connected to the ideal sine wave voltage source, R2 is connected to a voltmeter which measures the mean voltage and has an internal resistance R3 = 200300 Ω, the measured value is 109 V. Determine the effective source voltage.

Correct result:

U1 =  246.6253 V


R1=103000 Ω R2=197000 Ω R3=200300 Ω  U2=109 V U21=π U2/2=3.1416 109/2171.2168 V U22=U21/2=171.2168/2121.0686 V  I3=U22/R3=121.0686/2003000.0006 A I2=U22/R2=121.0686/1970000.0006 A I1=I2+I3=0.0006+0.00060.0012 A  U11=I1 R1=0.0012 103000125.5567 V  U1=U11+U22=125.5567+121.0686=246.6253 V

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