transformer calculations

• Step-up transformer


  Increases the potential difference of an electricity supply
• Step-down transformer


  Decreases the potential difference of an electricity supply
• Calculating potential difference in secondary coil

  Potential difference in primary coil / Potential difference in secondary coil = Number of turns in primary coil / Number of turns in secondary coil
• Power conservation in transformers


  Power in primary coil = Power in secondary coil (if 100% efficient)
• Calculating current in primary coil


  Potential difference in primary coil x Current in primary coil = Potential difference in secondary coil x Current in secondary coil
• Transformers in power transmission

  • Electricity transmitted at high voltages to reduce power losses
  • Step-up transformer at power station increases voltage
  • Step-down transformer at homes decreases voltage to 230V