A small transformer to recharge the battery in a cell phone is plugged into a wall socket that has 120 volts RMS and a maximum available current of 20 Amps. The secondary coil of the transformer has 14 turns, and the output voltage of the transformer is 5.5V (DC). The recharger takes 440mA out from the transformer. Assume the transformer is ‘ideal’, with and efficiency of 100 percent.
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