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Homework Help: 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?

    Thanks
     
  2. jcsd
  3. Jul 24, 2011 #2

    ehild

    User Avatar
    Homework Helper

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

    ehild
     
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