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If a step-up transformer connected a 120 V source is used to increase the voltage to...

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przybyh2 | Student, Undergraduate | (Level 2) eNoter

Posted June 21, 2013 at 2:16 PM via web

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If a step-up transformer connected a 120 V source is used to increase the voltage to 2000 V, how many turns are in the secondary coild if the primary coil has 110 turns?

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted June 21, 2013 at 2:33 PM (Answer #1)

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In a transformer, the number of turns in the primary coil P, the number of turns in the secondary coil S, the input voltage `V_I` and the output voltage `V_O` are related by: `P/S = V_I/V_O` . In a step up transformer the output voltage is greater than the input voltage, this requires a larger number of turns in the secondary coil than that in the primary coil.

If a step-up transformer connected a 120 V source is used to increase the voltage to 2000 V, and the primary coil has 110 turns, the secondary coil has (2000/120)*110 `~~` 1884 turns.

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