Q. 4 A fully charged mobile phone with a 12 V battery is good for a 10 minute talktime. Assume that, during the talk-time the battery delivers a constant current of 2 A and its voltage drops linearly from 12 V to 10 V as shown in the figure. How much energy does the battery deliver during this talk-time?
(A) 220 J
(B) 12 kJ
(C) 13.2 kJ
(D) 14.4 J
Answer: C
Explanation:
