What hazard is caused by charging or discharging a battery too quickly?
The correct answer is A: Overheating or out-gassing. The hazard caused by charging or discharging a battery too quickly is overheating or out-gassing. Rapid charging/discharging generates excessive heat, which can damage the battery, cause it to vent gas (out-gassing), and in extreme cases, cause explosion or fire. For amateur radio operators, this is especially important with lead-acid batteries. Always use chargers and loads rated for the battery capacity and avoid rapid charge/discharge cycles.
Exam Tip
Rapid charge/discharge = overheating or out-gassing. Think 'R'apid = 'R'isk of 'R'upture (overheating/out-gassing). Too fast generates heat and gas, can cause explosion. Not about ripple, rectification, or memory effect.
Memory Aid
"Rapid charge/discharge = overheating or out-gassing. Think 'R'apid = 'R'isk. Too fast generates heat and gas (hydrogen), can cause explosion or fire. Always use proper charge rates."
Real-World Application
You try to charge a 12V battery in 30 minutes using a high-current charger. The battery overheats, starts venting hydrogen gas, and could explode if a spark ignites the gas. Rapid charging generates excessive heat and gas production. Proper charging takes hours at a controlled rate to prevent these hazards.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Excess output ripple comes from power supply design, not from battery charge/discharge rate. Ripple is an AC component in DC output.
Option C: Incorrect. Half-wave rectification is a power supply circuit design, not a battery hazard. It's not related to charge/discharge rate.
Option D: Incorrect. Inverse memory effect isn't a real phenomenon - 'memory effect' applies to some NiCd batteries, but 'inverse memory effect' isn't a thing.
题目解析
The correct answer is A: Overheating or out-gassing. The hazard caused by charging or discharging a battery too quickly is overheating or out-gassing. Rapid charging/discharging generates excessive heat, which can damage the battery, cause it to vent gas (out-gassing), and in extreme cases, cause explosion or fire. For amateur radio operators, this is especially important with lead-acid batteries. Always use chargers and loads rated for the battery capacity and avoid rapid charge/discharge cycles.
考试技巧
Rapid charge/discharge = overheating or out-gassing. Think 'R'apid = 'R'isk of 'R'upture (overheating/out-gassing). Too fast generates heat and gas, can cause explosion. Not about ripple, rectification, or memory effect.
记忆口诀
Rapid charge/discharge = overheating or out-gassing. Think 'R'apid = 'R'isk. Too fast generates heat and gas (hydrogen), can cause explosion or fire. Always use proper charge rates.
实际应用示例
You try to charge a 12V battery in 30 minutes using a high-current charger. The battery overheats, starts venting hydrogen gas, and could explode if a spark ignites the gas. Rapid charging generates excessive heat and gas production. Proper charging takes hours at a controlled rate to prevent these hazards.
错误选项分析
Option B: Incorrect. Excess output ripple comes from power supply design, not from battery charge/discharge rate. Ripple is an AC component in DC output. Option C: Incorrect. Half-wave rectification is a power supply circuit design, not a battery hazard. It's not related to charge/discharge rate. Option D: Incorrect. Inverse memory effect isn't a real phenomenon - 'memory effect' applies to some NiCd batteries, but 'inverse memory effect' isn't a thing.
知识点
Battery charging, Overheating, Out-gassing, Battery safety
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.