Se CP10 21 P045 W Ask Your A transformer is to be used to provide power for a co

Question

Se CP10 21 P045 W Ask Your A transformer is to be used to provide power for a computer disk drive that needs 5.B V (rms) instead of the 120 V (rm) from the wal outlet. The number of turns in the primary is aid, and it delivers 500 mA (the secondary current) at an output voltage of 5.8 V (rms) (a) Should the transformer have more turns in the secondary compared to the primary, or fewer turns? O There should be more turns in the secondary. O There should be fewer turns in the secondary ) Find the current in the primary mA c) Find the niumber of turns in the secondary turns

Explanation / Answer

Given,

V1 = 120 V ; V2 = 5.8 V ; N1 = 310 ; I2 = 500 mA ;

a)There should be fewer turns in the secondary.

b)We know that

V1/V2 = I2/I1

I1 = (V2/V1) I2

I1 = (5.8/120) x 500 = 24.17 mA

Hence, I1 = 24.17 mA

c)We know that

N1/N2 = V1/V2

N2 = (V2/V1)N1

N2 = (5.8/120)310 = 14.98

Hence, N2 = 14.98 turms ( = 15 turns)

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