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  • Created by: Abbie
  • Created on: 27-05-12 12:09


Step up transformers - step up voltage, have more turns on secondary coil than primary

Step down transformers - step down voltage, more turns on primary coil than secondary

Work by electromagnetic induction:

  • Primary coil produces a magnetic field which stays within the iron core, meaning nearly all of it passes through to secondary coil
  • Because AC in the primary coil, the field in the iron core is constantly changing direction - changing magnetic field
  • This is felt by secondary coil
  • Induces an alternating voltage in secondary coil (same frequency as in primary) - electromagnetic induction
  • Relative no. of turns on the coils determines whether voltage induced in the secondary is greater or less than in the…


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