Which of the following is characteristic of an electrolytic capacitor?
The correct answer is C: High capacitance for a given volume. A characteristic of an electrolytic capacitor is high capacitance for a given volume. Electrolytic capacitors can store much more charge per unit volume than other types. For amateur radio operators, this makes them useful for power supply filtering. Understanding this helps when selecting capacitors.
Exam Tip
Electrolytic capacitor characteristic = high capacitance for given volume. Think 'E'lectrolytic = 'E'xtra 'C'apacitance per 'V'olume. Can store much more charge per unit volume than other types. Not tight tolerance, not less leakage, not RF capacitor - just high capacitance per volume.
Memory Aid
"Electrolytic capacitor characteristic = high capacitance for given volume. Think 'E'lectrolytic = 'E'xtra 'C'apacitance. Can store much more charge per unit volume than other types. Ideal for power supply filtering."
Real-World Application
You need a large capacitor for power supply filtering. An electrolytic capacitor can provide 10,000 µF in a small package, while a ceramic capacitor of the same size might only provide 1 µF. Electrolytic capacitors offer high capacitance for a given volume, making them ideal for power supply applications.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Electrolytic capacitors don't have tight tolerance - they typically have ±20% tolerance, which is loose. Tight tolerance isn't a characteristic.
Option B: Incorrect. Electrolytic capacitors have more leakage than other types - they're known for leakage current. Less leakage isn't a characteristic.
Option D: Incorrect. Electrolytic capacitors aren't inexpensive RF capacitors - they're used for power supply filtering, not RF. RF capacitors are different types.
题目解析
The correct answer is C: High capacitance for a given volume. A characteristic of an electrolytic capacitor is high capacitance for a given volume. Electrolytic capacitors can store much more charge per unit volume than other types. For amateur radio operators, this makes them useful for power supply filtering. Understanding this helps when selecting capacitors.
考试技巧
Electrolytic capacitor characteristic = high capacitance for given volume. Think 'E'lectrolytic = 'E'xtra 'C'apacitance per 'V'olume. Can store much more charge per unit volume than other types. Not tight tolerance, not less leakage, not RF capacitor - just high capacitance per volume.
记忆口诀
Electrolytic capacitor characteristic = high capacitance for given volume. Think 'E'lectrolytic = 'E'xtra 'C'apacitance. Can store much more charge per unit volume than other types. Ideal for power supply filtering.
实际应用示例
You need a large capacitor for power supply filtering. An electrolytic capacitor can provide 10,000 µF in a small package, while a ceramic capacitor of the same size might only provide 1 µF. Electrolytic capacitors offer high capacitance for a given volume, making them ideal for power supply applications.
错误选项分析
Option A: Incorrect. Electrolytic capacitors don't have tight tolerance - they typically have ±20% tolerance, which is loose. Tight tolerance isn't a characteristic. Option B: Incorrect. Electrolytic capacitors have more leakage than other types - they're known for leakage current. Less leakage isn't a characteristic. Option D: Incorrect. Electrolytic capacitors aren't inexpensive RF capacitors - they're used for power supply filtering, not RF. RF capacitors are different types.
知识点
Electrolytic capacitor, High capacitance, Volume efficiency, Capacitor types
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.