JAMB Physics 2012 Objective — Question 38

Question 38 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2012 Objective paper, with the correct answer and a full explanation.

A newly charged 12V accumulator can easily start a car whereas eight new dry cells in series with an effective e.m.f. of 12V cannot start the same car because the

A. current capacity is high
B. current capacity is lowCorrect
C. it cannot be re-charged
D. it cannot easily be connected to a car

Explanation

Dry cells have a much lower current capacity (higher internal resistance) than an accumulator, so despite having the same emf, they cannot supply the large starting current a car needs.

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