Multiple choice

Consider a parallel circuit with 10 cells each in 5 rows with emf 1.5 volt and resistance 1 Ω, where there is an external resistance of 20 Ω. Calculate the current.

  1. 0.166 amp

  2. 0.434 amp

  3. 230 amp

  4. 330 amp

  5. 0.68 amp

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E Correct answer
Explanation

Number of cells in a row n = 10 Number of such rows m = 5 i = nE/(R + nr/m) = 10 x 1.5/(20 + 10 x 1/5) = 15/22 = 0.68 amp