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9 July, 12:26

If the primary coil of a transformer has 200 turns and is supplied with 120 v ac power, how many turns must the secondary coil have to provide 12 v ac power?

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  1. 9 July, 14:26
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    The ratio of the turns to the voltage should be equal

    i. e: 200/120 = t/12

    so the secondary coil should have 20 turns
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