A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The…

Physics JAMB 2000

A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The efficiency of the cell is

  • 25%
  • 33%
  • 50%
  • 75% checkmark

The correct answer is: D

Explanation

Efficiency = Output/input x 100/1
Efficiency = 3/(3+1) x 100/1
= 3/4 x 100/1 = 75%

There is an explanation video available .

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