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30 December, 03:09

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.

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  1. 30 December, 05:46
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    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
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