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 5.6 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 5.6 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)There should be fewer turns in the secondary in order to get the less voltage on secondary side.

b)secondary turns/primary turns =secondary voltage/primary voltage=primary current/secondary current

primary current=[secondary voltage/primary voltage]*secondary current= = [5.6/120]*500=23.33 mA

c)secondary turns=primary turns*[secondary voltage/primary voltage]

=400*[5.6/120]=18.667 =19 turns

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