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51问答网 > 二极管正向电阻为零反向电阻无穷大以下几种情况输出端电位vf电压多大

二极管正向电阻为零反向电阻无穷大以下几种情况输出端电位vf电压多大

2025-04-04 11:17:56

推荐回答（1个）

回答1：

因为当滑动变阻的滑动头由A滑动到变阻器中心前均为正向偏置，二极管正向电阻为零，在R1、R2支路上，流经R1的电流被二极管分流掉一部分，所以先增大，当滑动到中心时，二极管零偏置，电流表的读数最大，为总电流的一半，当再往B滑动时，二极管处于反偏，二极管截止反向电阻无穷大，相当于断路，这时两条支路电阻相等，等于总电流的一半，所以，先增大后不变。

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