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JAMB Physics 2014 Question 36

Question 36

Current Electricity

The maximum power transfer occurs in a cell when the external resistance is

  1. A.the same as the internal resistance of the cell.
  2. B.greater than the internal resistance of the cell.
  3. C.less than the internal resistance of the cell.
  4. D.twice the internal resistance of the cell.
Show the answer and explanation

Answer: A (the same as the internal resistance of the cell.)

Explanation

The power delivered to the external resistor is greatest when the external resistance equals the cell's internal resistance.