A transformer is to be used to provide power for a computer disk drive that need

Question

A transformer is to be used to provide power for a computer disk drive that needs 5.2 V (rms) instead of the 120 V (rms) from the wall outlet. The number of turns in the primary is 395, and it delivers 500 mA (the secondary current) at an output voltage of 5.2 V (rms).
(a) Should the transformer have more turns in the secondary compared to the primary, or fewer turns?
___There should be more turns in the secondary.
___There should be fewer turns in the secondary.


(b) Find the current in the primary.
_____ mA

(c) Find the number of turns in the secondary.
______turns

Explanation / Answer

a)Fewer turns b)Ip = (6/120)*500 = 25 mA c)Ns = 395*(25/500) = 19.75 Turns

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