1. The problem statement, all variables and given/known data As attached. 2. Relevant equations - 3. The attempt at a solution I think P is a step-up transformer while Q is a step-down transformer. Does the current and/or voltage change during XY? I know the answer is either B or C, but I do not the explanation. Can anyone please explain to me the correct answer. Thank you very much and have a nice day ahead!