{{fa>pencil?32}} {{:elektrotechnik_1:schaltung_klws2020_2_3_3.jpg?400|schaltung_klws2020_2_3_3.jpg}} A circuit is given with the following parameters\\ $I_1 = 2 ~{\rm A}$\\ $R_2 = 5 ~\Omega$\\ $R_3 = 20 ~\Omega$\\ $U_3 = 1 ~{\rm V}$\\ $R_4 = 10 ~\Omega$\\ $U_4 = 3 ~{\rm V}$ Determine the open circuit voltage between A and B using the principle of superposition.