Here is an image with information: https://i.snag.gy/UMCRig.jpg I have calculated the total power dissipation as 11W. What I don't see is why R1 has a higher dissipation rate than R2/R3, and my main question is how do I calculate the power dissipation of R1? I get that R2/R3 are in series so have a lower resistance apparently, but each one has more ohms so should surely result in more power dissipation as the current passes them. Is the power dissipation referring to joules lost as heat per second, or useful electrical power in joules per second? Also, does this circuit refer to conventional energy flow from p to n, or real life flow from n to p? Not too clear, and there's no more information regarding the question. Appreciate all help, thank you.