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 6.0 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 6.0 V (rms).

(a) Should the transformer have more turns in the secondary compared to the primary, or fewer turns?

1

There should be more turns in the secondary. There should be fewer turns in the secondary.    
(b) Find the current in the primary.
2 mA
(c) Find the number of turns in the secondary.
3 turns

Explanation / Answer

a)There should be fewer turns in secondary.

b)Primary Current = 500 ma x 6/120 = 25 mA

c) number of turns in the secondary = 400 x 6/120 = 20 turns

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