Electrical Engineering › Section M · Transformers and polyphase systems › Topic M.3
Reflected impedance and impedance matching
Seen from its primary, a transformer makes its load look larger or smaller by the square of the turns ratio. That lets engineers match a speaker to an amplifier, feed many loudspeakers from one line, and keep two circuits electrically apart.
In this topic
- What the source sees
- The a-squared rule
- Power is reflected too
- Worked example: an inductive load
- Looking back towards the source
- Impedance matching for maximum power
- Worked example: matching a speaker
- Constant-voltage speaker lines
- Isolation
- Sensing displacement: the LVDT
- Common mistakes to avoid
- Key takeaways
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