A transformer is to be used to provide power for a computer disk drive that needs 6.4 V (rms) instead of the 120 V (rms) from the wall outlet. The number of turns in the primary is 405, and it delivers 500 mA (the secondary current) at an output voltage of 6.4 V (rms). Find the current in the primary.

Question

18 August, 13:15

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Answers (1)

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Makenna Mercado · Answer 1

The current in the primary is 0.026 A

Explanation:

Using the formula

I1 = (V1/V2) * I2

we have

I1 = (6.4/120) * 0.500

I1 = 0.026 A