A transformer is to be used to provide power for a computer disk drive that needs 6.6 V (rms) instead of the 120 V (rms) from the wall outlet. The number of turns in the primary is 400, and it delivers 500 mA (the secondary current) at an output voltage of 6.6 V (rms).
(a) Find the current in the primary.
mA
(b) Find the number of turns in the secondary.