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Electronics Engineering QUESTION #11716
Question 1
A lead-acid battery bank rated $200\,\text{Ah}$ at $12\,\text{V}$ is discharged at $C/10$ rate. The discharge current and time to full discharge are:
  • $2\,\text{A}$ for $10\,\text{hours}$
  • $20\,\text{A}$ for $10\,\text{hours}$✔️
  • $2\,\text{A}$ for $100\,\text{hours}$
  • $10\,\text{A}$ for $20\,\text{hours}$
Correct Answer Explanation
$C/10 = \dfrac{200\,\text{Ah}}{10\,\text{h}} = \mathbf{20\,\text{A}}$. Discharging at the $C/10$ rate means a 10-hour complete discharge. Higher discharge rates (e.g. $C/1$) reduce effective capacity due to Peukert's effect. The $C/10$ or $C/20$ rating is the standard for lead-acid battery specifications.