Why are switching amplifiers more efficient than linear amplifiers?
The correct answer is B: The switching device is at saturation or cutoff most of the time. Why are switching amplifiers more efficient than linear amplifiers is that the switching device is at saturation or cutoff most of the time. Switching devices dissipate less power when fully on or off. For amateur radio operators, this is important for amplifier knowledge. Understanding this helps when selecting amplifiers.
Exam Tip
Switching amplifiers more efficient = switching device at saturation or cutoff most of the time. Think 'S'witching 'A'mplifier = 'S'aturation/'C'utoff (low power dissipation). Switching devices dissipate less power when fully on or off. Not higher voltages, not high gain, not push-pull - just saturation/cutoff most of the time.
Memory Aid
"Switching amplifiers more efficient = switching device at saturation or cutoff most of the time. Think 'S'witching = 'S'aturation/'C'utoff. Switching devices dissipate less power when fully on or off. Important for amplifier knowledge."
Real-World Application
Switching amplifiers are more efficient than linear amplifiers: It's because the switching device is at saturation or cutoff most of the time. When fully on or off, the device dissipates minimal power. This is the reason - saturation/cutoff most of the time.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Operating at higher voltages isn't the reason - switching device being at saturation/cutoff is the reason. Higher voltages isn't the reason.
Option C: Incorrect. Linear amplifiers having high gain isn't the reason - switching device being at saturation/cutoff is the reason. High gain isn't the reason.
Option D: Incorrect. Switching amplifiers using push-pull circuits isn't the reason - switching device being at saturation/cutoff is the reason. Push-pull isn't the reason.
题目解析
The correct answer is B: The switching device is at saturation or cutoff most of the time. Why are switching amplifiers more efficient than linear amplifiers is that the switching device is at saturation or cutoff most of the time. Switching devices dissipate less power when fully on or off. For amateur radio operators, this is important for amplifier knowledge. Understanding this helps when selecting amplifiers.
考试技巧
Switching amplifiers more efficient = switching device at saturation or cutoff most of the time. Think 'S'witching 'A'mplifier = 'S'aturation/'C'utoff (low power dissipation). Switching devices dissipate less power when fully on or off. Not higher voltages, not high gain, not push-pull - just saturation/cutoff most of the time.
记忆口诀
Switching amplifiers more efficient = switching device at saturation or cutoff most of the time. Think 'S'witching = 'S'aturation/'C'utoff. Switching devices dissipate less power when fully on or off. Important for amplifier knowledge.
实际应用示例
Switching amplifiers are more efficient than linear amplifiers: It's because the switching device is at saturation or cutoff most of the time. When fully on or off, the device dissipates minimal power. This is the reason - saturation/cutoff most of the time.
错误选项分析
Option A: Incorrect. Operating at higher voltages isn't the reason - switching device being at saturation/cutoff is the reason. Higher voltages isn't the reason. Option C: Incorrect. Linear amplifiers having high gain isn't the reason - switching device being at saturation/cutoff is the reason. High gain isn't the reason. Option D: Incorrect. Switching amplifiers using push-pull circuits isn't the reason - switching device being at saturation/cutoff is the reason. Push-pull isn't the reason.
知识点
Switching amplifiers, More efficient, Linear amplifiers, Switching device, Saturation or cutoff, Most of the time
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.