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JAMB Physics 2006 Question 31

Question 31

Current Electricity

A cell of internal resistance r is connected to an external resistor R. The condition for maximum power transfer is

  1. A.R < r
  2. B.R = 2r.
  3. C.R = r.
  4. D.R > r.
Show the answer and explanation

Answer: C (R = r.)

Explanation

The maximum power is delivered to the external resistor when its resistance equals the internal resistance of the cell: R = r.