Published by:
CGP EDU Academic Team
Published on: September 12, 2026
The battery of a mobile phone is rated as 
. How much energy is stored ir it when fully charged?
Text Solution
Verified by ExpertsThe correct answer is:
A
To find the energy stored in the battery, follow these steps:
Convert mAh to Ah:
The battery capacity is given as 5800 mAh . Since
we have
Calculate energy in watt-hours (Wh):
The energy in Wh is given by the product of the voltage and the capacity in Ah. Thus,
Energy 
.
Convert watt-hours to joules (J):
Since
the total energy in joules is:
Thus, the energy stored in the battery when fully charged is about 87.7 kJ.
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