Exam-style question
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If a typical smartphone battery has a capacity of about 3000 mAh, how much charge does it store in coulombs?.
- A.10 C
- B.30 C
- C.300 C
- D.3000 C
Model answer
What a good answer should say
- 10 C
Explanation
Why this works
To convert mAh to coulombs, use the conversion: 1 mAh = 3.6 C. Therefore, 3000 mAh = 3000 × 3.6 C = 10800 C.
This estimate checks out as it aligns with typical smartphone battery capacities.
Common mistake
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