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Exercise 4.5.4 - Variation: open circuit voltage via superposition (exam task, approx. 12% of a 60-minute exam, WS2020)
A circuit is given with the following parameters
$I_1=2 A$
$R_2=5 \Omega$
$R_3=20 \Omega$
$U_3=1 V$
$R_4=10 \Omega$
$U_4=3 V$
Determine the open circuit voltage between A and B using the principle of superposition.