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
TIME PERIOD IS 2 SEC THEN WHY WE TAKE 1 MIN ?
ReplyDeletewe did not take 1 min.
Deletebut we calculated the amount of charge required for 1 time.