The battery of a mobile phone is rated as . How much energ…

Physics Current Electricity Electrical Instruments Single Correct MCQ

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?

87.7 kJ

43.8 kJ

48.7 kJ

24.4 kJ

Text Solution

Verified by Experts

The correct answer is:

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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