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Tuesday, October 15, 2019

The charge that a fully charged 12 V car battery can supply is 100 kC. The starter motor of the car requires a current of 200 A for an average period of 2.0 s.


Question 16
The charge that a fully charged 12 V car battery can supply is 100 kC. The starter motor of the car requires a current of 200 A for an average period of 2.0 s. The battery does not recharge because of a fault.

What is the maximum number of times the starter motor of the car can be used?
A 21                 B 25                 C 42                D 250





Reference: Past Exam Paper – June 2016 Paper 12 Q35





Solution:
Answer: D.


Total charge = 100 kC = 100 000 C


The starter motor of the car requires a current of 200A for an average period of 2.0 s.

Charge Q = It
Q = 200 × 2.0 = 400 C


The starter motor requires a charge of 400 C when used for 1 time.

400 C - - > 1 time
100 000 C - - > 100 000 / 400 = 250 times

2 comments:

  1. TIME PERIOD IS 2 SEC THEN WHY WE TAKE 1 MIN ?

    ReplyDelete
    Replies
    1. we did not take 1 min.
      but we calculated the amount of charge required for 1 time.

      Delete

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