I assume you mean P=I*E

If you do that equation, when you are just trying to find the heat (P) generated by one of the two loads, then E has to be the voltage dropped just by that load, not the entire E of the circuit.

It’s easier, in my opinion, to use a different formula for P. First find the circuit current, I, which is straightforward because you know the source voltage and the total resistance in the circuit. Then you can use a formula for P that just uses current and R of the load of interest.

We used this technique to calculate the heat generated by a loose connection that was in series with an element at the end of Unit 3, if you want to review that.

I’ll reset you, but for future reference, please use the Quiz and Exam Reset Request form under “Contact” in the main menu – thanks!