A transformer is to be used to provide power for a computer diskdrive that needs

Question

A transformer is to be used to provide power for a computer diskdrive that needs 5.0 V (rms)instead of the 120 V (rms) from the wall outlet. The number ofturns in the primary is 400, andit delivers 500 mA (the secondary current) at an output 5.0 V (rms). (a) Should the transformer have more turns in the secondarycompared to the primary, or fewer turns? Thereshould be more turns in the secondary. Thereshould be fewer turns in the secondary.
(b) Find the current in the primary.
mA
(c) Find the number of turns in the secondary.
turns


A transformer is to be used to provide power for a computer diskdrive that needs 5.0 V (rms)instead of the 120 V (rms) from the wall outlet. The number ofturns in the primary is 400, andit delivers 500 mA (the secondary current) at an output 5.0 V (rms). (a) Should the transformer have more turns in the secondarycompared to the primary, or fewer turns? Thereshould be more turns in the secondary. Thereshould be fewer turns in the secondary.
(b) Find the current in the primary.
mA
(c) Find the number of turns in the secondary.
turns


(a) Should the transformer have more turns in the secondarycompared to the primary, or fewer turns? Thereshould be more turns in the secondary. Thereshould 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 for a step down transformer

b) 500 mA/16.67=30 mA

c) 400*5/120=16.67 turns or 17 to nearest higher number

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