What is the minimum allowable discharge voltage for maximum life of a standard 12-volt lead-acid battery?
The correct answer is C: 10.5 volts. The minimum allowable discharge voltage for maximum life of a standard 12-volt lead-acid battery is 10.5 volts. Discharging below 10.5V damages the battery and reduces its life. For amateur radio operators, this is critical for battery maintenance. Understanding this helps preserve battery life.
Exam Tip
12V lead-acid minimum discharge = 10.5 volts. Think '1'2V battery = '1'0.5V minimum. Discharging below 10.5V damages battery and reduces life. Not 6V, not 8.5V, not 12V - just 10.5V for maximum life.
Memory Aid
"12V lead-acid minimum discharge = 10.5 volts. Think '1'2V battery = '1'0.5V minimum. Discharging below 10.5V damages battery and reduces life. Critical for battery maintenance."
Real-World Application
You use a 12-volt lead-acid battery for portable operation. You monitor the voltage and stop using it when it reaches 10.5 volts. Discharging below 10.5V causes sulfation and reduces battery life. Keeping discharge above 10.5V maximizes battery life.
Key Concepts
Why Other Options Are Wrong
Option A (6 volts): Incorrect. 6 volts is way too low - that would severely damage the battery. 6V is half the nominal voltage, which would destroy the battery.
Option B (8.5 volts): Incorrect. 8.5 volts is too low - that would still damage the battery. 10.5V is the minimum for maximum life.
Option D (12 volts): Incorrect. 12 volts is the nominal voltage, not the minimum discharge voltage. Batteries can discharge below 12V without damage.
题目解析
The correct answer is C: 10.5 volts. The minimum allowable discharge voltage for maximum life of a standard 12-volt lead-acid battery is 10.5 volts. Discharging below 10.5V damages the battery and reduces its life. For amateur radio operators, this is critical for battery maintenance. Understanding this helps preserve battery life.
考试技巧
12V lead-acid minimum discharge = 10.5 volts. Think '1'2V battery = '1'0.5V minimum. Discharging below 10.5V damages battery and reduces life. Not 6V, not 8.5V, not 12V - just 10.5V for maximum life.
记忆口诀
12V lead-acid minimum discharge = 10.5 volts. Think '1'2V battery = '1'0.5V minimum. Discharging below 10.5V damages battery and reduces life. Critical for battery maintenance.
实际应用示例
You use a 12-volt lead-acid battery for portable operation. You monitor the voltage and stop using it when it reaches 10.5 volts. Discharging below 10.5V causes sulfation and reduces battery life. Keeping discharge above 10.5V maximizes battery life.
错误选项分析
Option A (6 volts): Incorrect. 6 volts is way too low - that would severely damage the battery. 6V is half the nominal voltage, which would destroy the battery. Option B (8.5 volts): Incorrect. 8.5 volts is too low - that would still damage the battery. 10.5V is the minimum for maximum life. Option D (12 volts): Incorrect. 12 volts is the nominal voltage, not the minimum discharge voltage. Batteries can discharge below 12V without damage.
知识点
Lead-acid battery, Discharge voltage, 10.5 volts, Battery life
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.