A 12V-DC power supply that gets it's power from the 110V (RMS) wall outlet needs a transformer as a first step in generating its output. The rectification and regulation stage of the power supply needs an input voltage of 15V (peak)
A. What winding ratio should the transformer have?
B. If the power supply has an effective impedence of 100 ohms (the load impedence that the transformer sees) what impedence does the primary of the transformer see?