We were in the middle of working on this together in the thread above.
First step: rewatch the video at the end of Unit 3 about calculating the heat generated by a loose connection. (That loose connection is acting like a “load” in that it has resistance and generates heat when current is going through it.)
Note that we first calculate the current going through the circuit, I.
Then we use a formula for P to find the heat generated by that particular “load” in the circuit. Write down the steps in your own notebook and make sure you understand what we did there.
Let me know!