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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

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?