A mobile phone battery is charged by connecting it to a constant potential difference of 5.0 V.
After a time of 1.0 hour, the initial current of 0.50 A slowly decreases to zero, as shown.
What is the best estimate of the energy transferred to the battery during the time of 2.0 hours shown in the graph?
1 )
2700 J
2 )
9000 J
14 000 J
4 )
18 000 J
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