There is a schematic editor here. It will display the schematic right side up. (Or, you could have used Windows Paint or some other program to rotate that image counter-clockwise by 90 degrees before posting it.) Regardless, there are two unknown nodes, though one of them is exactly 12 volts apart from the other. Which node was the result of your final calculation of 68 volts? Also, have you tried to simulate the circuit?
↧