Electrical Engineering › Section F · Network theorems (dc) › Topic F.4

Maximum power transfer

Connect different loads to the same source and the power they receive rises, peaks and falls again. The peak comes when the load resistance equals the source's Thevenin resistance, but that peak costs half the power, which is why engineers match some systems and deliberately mismatch others.

In this topic

  • Too small, too large, just right
  • The theorem
  • How much power is that?
  • Worked example: choosing the load
  • Efficiency
  • Worked example: power against efficiency
  • When the load is fixed instead
  • Where matching is used
  • Common mistakes to avoid
  • Key takeaways

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