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第152章 生动的课堂(2 / 2)

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张老师一脸严肃地转身,把那根被全班尊称为“大宝贝”的自动打气筒在手中转了个圈,然后重重地往讲桌上一戳,“不许哭哭啼啼的,鳖jing1。你以为这节课是你能左右的吗?现在,全班注意力统一转向——我们开始今天的通用技术神圣课程。”

“你们看,这只大宝贝的结构。”张老师将它竖了起来,像舞台剧的法杖一样高高举过头顶,“它有两个极性,一个是凸出来的一部分,另一边则是微微凹进去的部分。”

“听着,这很关键!”他用粉笔在黑板上狂写“阳极(A)”“阴极(K)”,然后猛地一转身,拿着大宝贝比划着,“凸的这边,就像你们的自信心,当你考试考得好,哼,阳极上扬;而凹的那边,就像鳖jing1的脸皮,被我一踩,就会深陷进去,这就是阴极。”

“你别拿我脸做比喻啊!”鳖jing1已经在角落里蹲下,捂着脸发抖,“老师我错了!我真的不是故意的!!我再也不敢对您有任何的不敬了!”

“别吵!”张老师厉声喝道,像是在进行严肃的军训,“我们现在讲它的特性!听好了,这可是要考的内容!”

他两步冲到讲台边缘,把大宝贝朝空中一挥,“对于普通二极管,它的导通条件是阳极为正极,阴极为负极!什么叫正极负极?来,我给你们打个比方。阳极就像咱们皮皮一世,他每天早上满面阳光,从不迟到;阴极呢?就像朱孝公顶针,睡得跟猪一样,五分钟都不想醒!现在,把这俩人用数据线一接——啪的一声,正向偏置达成,电流就像被老班骂完之后的早读,全员上线,电路导通,嘎嘎流畅!”

“反过来呢?”张老师又把大宝贝反着举起来,“如果我们搞反了——让顶针当阳极,让皮皮当阴极,那就是逆天行事、阴阳错乱!这叫反向偏置!电流就像被罗敷丹抓住看小黄书的你们,立马断电,全体停机,什么都别想干了!”

“这……也太生动了吧。”朱孝公顶针嘀咕。

“生动你个头!”张老师一个箭步冲回来,“对于这一点我希望大家牢记!否则考试的时候绝对会有大量的分数扣在这一方面!”

张老师停顿了一秒,目光扫过全班,缓缓地从讲桌下方拿出一块带电的实验板,然后——啪地把鳖jing1的大宝贝插在了上面。

“现在,我们就开始做个小实验吧!”

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