AQA A Level Physics

Revision Notes

7.10.5 Transformer Efficiency

Eddy Currents

  • In reality, transformers are not 100% energy efficient and there are sources of energy losses
  • Coils of wire have resistance
    • Heat energy is lost from the current flowing through the coil. This is due to the resistance of the wire
  • Eddy currents are induced in the iron core
    • This is because the iron core is the region of the changing magnetic field
    • Eddy currents are reduced by using a laminated iron core

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