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Solution


Q.

The battery of a mobile phone is rated as 4.2 V, 5800 mAh. How much energy is stored in it when fully charged          [2025]
1 43.8 kJ  
2 48.7 kJ  
3 87.7 kJ  
4 24.4 kJ  

Ans.

(3)

Given V = 4.2 Volt

∴ Energy supplied by battery

     W=Vq=4.2×5800×3600×10–3J=87.696 kJ

∴ Energy stored in the battery when fully charged

       =87.696 kJ ≈ 87.7 kJ