European trip. In France, the wall sockets provide an AC voltage with V_rms = 230 V. You want to use an appliance designed to operate in the United States (V_rms = 120 V) and decide to build a transformer to convert the power line voltage in France to the value required by your appliance.
(a) Should you use a “stepdown” transformer (to make V_rms smaller) or a “step-up” transformer (which makes V_rms larger)?
(b) If the input coil of your transformer has 2000 turns, how many turns should the output coil have?