given: source voltage =120V voltage across 15 ohm resistor = Va there is a dependent source 2Va and a 30 ohm resistor. I tried applying KVL i.e 120-30I+2Va-Va=0 where Va=15I and got I=2.66A whereas my teacher told me that the answer is 8A. how is it so? Is it some basic knowledge that I have overlooked? Also as a side note, I have difficulty knowing which theorem to apply in which circuit. I do practise problems but even then I have difficulties especially in chapters like 2-port network. Are there any tips regarding that?