What is the primary cause of loss in film capacitors at RF?
The correct answer is D: Skin effect. What is the primary cause of loss in film capacitors at RF is skin effect. Skin effect in the capacitor's electrodes causes loss at RF. For amateur radio operators, this is important for understanding capacitor losses. Understanding this helps when selecting capacitors.
Exam Tip
Film capacitor loss at RF = skin effect primary cause. Think 'F'ilm 'C'apacitor 'L'oss = 'S'kin 'E'ffect. Skin effect in the capacitor's electrodes causes loss at RF. Not inductance, not dielectric loss, not self-discharge - just skin effect.
Memory Aid
"Film capacitor loss at RF = skin effect primary cause. Think 'F'ilm 'C'apacitor = 'S'kin 'E'ffect loss. Skin effect in the capacitor's electrodes causes loss at RF. Important for understanding capacitor losses."
Real-World Application
Film capacitors at RF: The primary cause of loss is skin effect. At RF frequencies, skin effect in the capacitor's metal electrodes increases resistance and causes loss. This is the primary cause - skin effect.
Key Concepts
Why Other Options Are Wrong
Option A (Inductance): Incorrect. Inductance isn't the primary cause of loss - skin effect is. Inductance isn't the primary cause.
Option B (Dielectric loss): Incorrect. Dielectric loss isn't the primary cause at RF - skin effect is. Dielectric loss isn't the primary cause.
Option C (Self-discharge): Incorrect. Self-discharge isn't the primary cause of loss - skin effect is. Self-discharge isn't the primary cause.
题目解析
The correct answer is D: Skin effect. What is the primary cause of loss in film capacitors at RF is skin effect. Skin effect in the capacitor's electrodes causes loss at RF. For amateur radio operators, this is important for understanding capacitor losses. Understanding this helps when selecting capacitors.
考试技巧
Film capacitor loss at RF = skin effect primary cause. Think 'F'ilm 'C'apacitor 'L'oss = 'S'kin 'E'ffect. Skin effect in the capacitor's electrodes causes loss at RF. Not inductance, not dielectric loss, not self-discharge - just skin effect.
记忆口诀
Film capacitor loss at RF = skin effect primary cause. Think 'F'ilm 'C'apacitor = 'S'kin 'E'ffect loss. Skin effect in the capacitor's electrodes causes loss at RF. Important for understanding capacitor losses.
实际应用示例
Film capacitors at RF: The primary cause of loss is skin effect. At RF frequencies, skin effect in the capacitor's metal electrodes increases resistance and causes loss. This is the primary cause - skin effect.
错误选项分析
Option A (Inductance): Incorrect. Inductance isn't the primary cause of loss - skin effect is. Inductance isn't the primary cause. Option B (Dielectric loss): Incorrect. Dielectric loss isn't the primary cause at RF - skin effect is. Dielectric loss isn't the primary cause. Option C (Self-discharge): Incorrect. Self-discharge isn't the primary cause of loss - skin effect is. Self-discharge isn't the primary cause.
知识点
Primary cause of loss, Film capacitors at RF, Skin effect, Capacitor losses
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.