Which of the following is a safety hazard of a 12-volt storage battery?
The correct answer is B: Shorting the terminals can cause burns, fire, or an explosion. A safety hazard of a 12-volt storage battery is that shorting the terminals can cause burns, fire, or an explosion. Lead-acid batteries can deliver very high current when shorted, generating intense heat, sparks, and potentially causing the battery to explode from hydrogen gas ignition. For amateur radio operators, this is a critical safety concern when working with batteries. Always use proper battery handling procedures and avoid creating short circuits.
Exam Tip
12V battery hazard = shorting terminals. Think 'S'horting = 'S'erious hazard. Can cause burns, fire, explosion from high current and hydrogen gas. 12V won't shock through skin, RF doesn't create poison gas.
Memory Aid
"12V battery hazard = shorting terminals. Think 'S'horting = 'S'erious hazard. High current can cause burns, fire, explosion. Always be careful with tools around batteries."
Real-World Application
You accidentally drop a wrench across a 12V battery's terminals. The short circuit draws hundreds of amps, creating intense heat and sparks. If hydrogen gas has built up in the battery, it can ignite and cause an explosion. This is why you should always be careful with tools around batteries and use insulated tools when possible.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Touching both terminals with hands won't cause electrical shock at 12 volts - 12V DC is below the threshold for dangerous shock. However, shorting with a tool can be dangerous.
Option C: Incorrect. RF emissions don't cause electrolyte to emit poison gas - this isn't a real hazard. RF doesn't affect battery chemistry this way.
Option D: Incorrect. Since A and C are not correct hazards, 'all of the above' cannot be correct. Only shorting terminals is the real safety hazard.
题目解析
The correct answer is B: Shorting the terminals can cause burns, fire, or an explosion. A safety hazard of a 12-volt storage battery is that shorting the terminals can cause burns, fire, or an explosion. Lead-acid batteries can deliver very high current when shorted, generating intense heat, sparks, and potentially causing the battery to explode from hydrogen gas ignition. For amateur radio operators, this is a critical safety concern when working with batteries. Always use proper battery handling procedures and avoid creating short circuits.
考试技巧
12V battery hazard = shorting terminals. Think 'S'horting = 'S'erious hazard. Can cause burns, fire, explosion from high current and hydrogen gas. 12V won't shock through skin, RF doesn't create poison gas.
记忆口诀
12V battery hazard = shorting terminals. Think 'S'horting = 'S'erious hazard. High current can cause burns, fire, explosion. Always be careful with tools around batteries.
实际应用示例
You accidentally drop a wrench across a 12V battery's terminals. The short circuit draws hundreds of amps, creating intense heat and sparks. If hydrogen gas has built up in the battery, it can ignite and cause an explosion. This is why you should always be careful with tools around batteries and use insulated tools when possible.
错误选项分析
Option A: Incorrect. Touching both terminals with hands won't cause electrical shock at 12 volts - 12V DC is below the threshold for dangerous shock. However, shorting with a tool can be dangerous. Option C: Incorrect. RF emissions don't cause electrolyte to emit poison gas - this isn't a real hazard. RF doesn't affect battery chemistry this way. Option D: Incorrect. Since A and C are not correct hazards, 'all of the above' cannot be correct. Only shorting terminals is the real safety hazard.
知识点
Battery safety, Short circuits, Lead-acid batteries, Electrical safety
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.