Electrical Engineering › Section M · Transformers and polyphase systems › Topic M.2
The iron-core transformer and power transmission
An iron-core transformer changes an ac voltage up or down with almost no loss, using nothing but two windings and a shared core. That one ability is why power grids run on alternating current and send energy hundreds of kilometres at very high voltage.
In this topic
- The ideal iron-core transformer
- The transformer emf equation
- The turns ratio
- Worked example: sizing a small transformer
- Currents follow the inverse ratio
- Worked example: a distribution transformer
- Why transformers need alternating current
- High voltage for transmission
- Worked example: losses at two voltages
- From power station to wall socket
- Common mistakes to avoid
- Key takeaways
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