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If the capacity of a battery is 4000mAh, it can supply 4 Ampere current for
1. 120 min
2. 240 min
3. 60 min
4. 30 min

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Correct Answer - Option 3 : 60 min


The capacity of the battery is represented in terms of Amp-hour.

The capacity of battery = current delivered × duration of time

Battery capacity unit mAh means when 1 mA of current is drawn from a battery it will take 1 hour to discharge.


The capacity of battery = 4000 mAh

Current delivered = 4 A

\(Duration \ of \ time = \frac{4000 \ mAh}{4 \ A}\)

\(T = \frac{4000\times10^{-3}h}{4 \ A}=1 \ hour\)

T = 60 min

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