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current electricity physics

Why is it so that current through external resistance is maximum when total internal resistance of the circuit is equal to external resistance?

Asked Shiny

Please refer to the following

  1. https://en.wikipedia.org/wiki/Maximum_power_transfer_theorem
  2. http://www.allaboutcircuits.com/textbook/direct-current/chpt-10/maximum-power-transfer-theorem/
  3. http://www.electrical4u.com/maximum-power-transfer-theorem/
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