On this episode Canelina the cat cries as she does not understand what is impedance matching and that there is then maximum power transfer.
The wise seaguls on the beach tell her that at open circuit conditions the voltage across the terminals of a real voltage source is maximum. When something is connected there is a voltage drop across the terminals.
So any real voltage source behaves as an ideal voltage source in series with a resistance, called internal resistance or output resistance.
When the load is of the same value as Ri the voltage across the terminals has dropped to half the open circuit value.
Maximum power transfer is then possible as at these counditions it is the product of voltage and current which is maximum, VxI. VxI is power. The voltage across the terminals time the current through them. Or the voltage across the load times the current through it.
Canelina jumps from joy, invites her friends and they all dance at the beach under the sun that leaves no shadows to truth.
Reference:
Electronics, a systems approach - Neil Storey
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