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Connecting a transformer backward

  1. Jul 23, 2011 #1
    An electric doorbell requires a 12 V, 60 Hz ac supply. If the transformer is connected the wrong way around the circuit, what voltage is supplied to the doorbell?

    If figured the voltage ratio would now be 120/12, or 10, and 10 x 120 = 1200V. Is this right?

    My other idea was that connecting the transformer the wrong way would simply supply the doorbell with 120 V.

    Which is right?

  2. jcsd
  3. Jul 24, 2011 #2


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    It is right. And certainly a fuse will blow off to stop this voltage supply.

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