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Question

A fully charged mobile phone with a 12 V battery is good for a 10 minutes talk-time. 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 during this talk-time?

A
220 J
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B
12 kJ
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C
13.2 kJ
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D
14.4 J
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