A cell of internal resistance 2 ohms suppli..

Question 1 Report

A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The efficiency of the cell is

12.0%

25.0%

33.3%

75.0%

Answer Details

Efficiency = $\frac{I R}{I (R + r)}$ x 100

= $\frac{6}{I (2 + 6)}$ x 100

= 75%