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Homework Help: Electromagnetic effects

  1. Jan 3, 2008 #1
    A battery charger which works from the 240 V mains supply contains a transformer which provides an output of 15 V.

    What is the number of turns on the secondary coil if there are 6400 turns on the primary coil of the transformer?
  2. jcsd
  3. Jan 3, 2008 #2


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    Do you know absolutely nothing about this? Does knowing that 240= 15(16) help?
  4. Jan 3, 2008 #3
    As far as I know, for a transformer V1/V2 = n1/n2 where V1 and V2 are voltages and n1 and n2 are numbers of turns on coils. So in this case you have to solve 240/15 = 6400/x. Honestly, I'm not fully certain is this correct, We'll begin electrodynamics next week at school. But anyway, I hope that helps.
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