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 7.0 V (rms) instead of the 120 V (rms) from the wall outlet. The number of turns in the primary is 274, and it delivers 500 mA (the secondary current) at an output voltage of 7.0 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

Required V = 7V

Wall V = 120V

Np = 274

Is = 500 mA

a) LESS TURNS IN SECONDARY COMPARED TO PRIMARY. --------ANSWER

b) 7 X 500 = 120 X Ip => Ip = 29.167 mA -------------------ANSWER

c) No. of turns in secondary = 7*274/120 = 16 turns ---------------ANSWER

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