Transformers

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Cards (6)

  • A basic transformer consists of a primary coil and a secondary coil wound on an iron core
  • Iron is used in transformers as it is easily magnetised
  • In a step-up transformer Vs > Vp
  • In a step-down transformer Vs < Vp
  • If transformers were 100% efficient, the electrical power output would equal the electrical power input
  • VpVs=\frac{V_p}{V_s} =NpNs \frac{N_p}{N_s}
    N = Number of turns of each coil