A battery is rated 20 A-hr and is delivering a current of 2A.
How long does it last?
A. 1 hr
B. 5 hrs
C. 8 hrs
D. 10 hrs
Show Answer
Answer: D
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A battery’s capacity is typically given in ampere-hours (Ah). This capacity rating tells you how much current the battery can provide over a certain period of time. If a battery is rated at 20 Ah, it means that it should be able to deliver 20 amps for one hour.
If you’re drawing 2 amps from a 20 Ah battery, you can expect it to last for about 10 hours. This is because 20 Ah divided by 2 A equals 10 hours.
However, keep in mind that these calculations are idealized. In practice, a battery’s actual performance can be influenced by a number of factors, including its age, its discharge rate, the ambient temperature, and more. As such, the actual lifetime of the battery under these conditions could be somewhat less than the calculated 10 hours.