“feedback”的概念、定义、习题解题方法及翻译-物理辞典

单词	feedback
释义	feedback The use of part of the output of a system to control its performance. In positive feedback , the output is used to enhance the input; an example is an electronic oscillator, or the howl produced by a loudspeaker that is placed too close to a microphone in the same circuit. A small random noise picked up by the microphone is amplified and reproduced by the loudspeaker. The microphone now picks it up again; it is further amplified, and fed from the speaker to microphone once again. This continues until the system is overloaded. In negative feedback , the output is used to reduce the input. In electronic amplifiers, stability is achieved, and distortion reduced, by using a system in which the input is decremented in proportion as the output increases. A similar negative feedback is used in governors that reduce the fuel supply to an engine as its speed increases
随便看	absolute temperature absolute value absolute zero absorptance absorption absorption coefficient absorption spectrum absorptivity abundance acceleration acceleration of free fall accelerator acceptor acceptor levels accommodation accretion disc accumulator achromatic lens acoustics acoustoelectronic devices actinic radiation actinium actinium series actinoid contraction actinometer

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