Vs = 120 Volts There is 1 amp of current flowing through the 5 ohm resistor. Since the 25 ohm resistor is in series, 25 volts is dropped across it. There is 30 volts across the series 25 + 5 ohm resistor combination ( = 25 + 5 volts) This means that there is 30 volts across the parallel 10 ohm, 30 ohm, and series combination 25 + 5 ohm combination There is 1 amp current flowing through the 30 ohm resistor, 1 amp through the 25 + 5 resistor combination and 3 amps in the 10 ohm resistor The total current flowing through the 6 and 12 ohm resistors is 5 amps (= 1+1+3) V 12 ohm = 60 volts V 6 ohm = 30 volts Vs = V 12 ohm + V 6 ohm + V across the 5 + 25 ohm combination = 60 + 30 + 30 volts Vs = 120 volts.
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