Question 38
Current ElectricityA 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
- A.the current capacity is high
- B.the current capacity is low
- C.it cannot be re-charged
- D.it cannot easily be connected to a car.
Show the answer and explanation
Answer: B (the current capacity is low)
Explanation
Dry cells have a high internal resistance and a low current capacity, so they cannot supply the very large current a starter motor needs.