Yes .. it was a silly mistakeYour Vth and Rth looks good, but your power calculations are wrong.
If Rth = Rsurce = 1.64Ω
Why do you think that that current has any meaning?Yes .. it was a silly mistake
So, shall I calculate the current (I = Vth / Rth) and find the power ?
Which current? Which resistance?because the formula of power is P = 0.5 I2 R
so, we have to find the current. I am learning and trying to understand not throwing numbers and formulas