An ideal step-down transformer has a primary coil of 300 turns and a secondary coil of 28 turns. It is plugged into an outlet with 120 V (AC) from which it draws a current of 0.69 A.
a) What is the voltage in the secondary coil?
b) calculate the rms current in the secondary coil
c) Assuming that the transformer secondary is driving a resistive load, calculate the average power dissipated in the resistor.