1. The problem statement, all variables and given/known data A practical voltage source has a voltage effieciency of 90% when connected to a load of 9 Ohms. When connected to a load of 4 Ohms, the load voltage was 160V. Determine the source voltage and the max power. Can anyone help me with this question? 2. Relevant equations P = (I^2)*(R) 3. The attempt at a solution I'm not getting the correct answer.