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阿Q吧 > 不是说电阻串联分压并联分流吗，稳压管前串联的限流电阻，既然是串联的，为什么不是分压电阻？

不是说电阻串联分压并联分流吗，稳压管前串联的限流电阻，既然是串联的，为什么不是分压电阻？

2025-03-16 07:37:40

推荐回答（2个）

回答1：

稳压管特性是利用反向击穿后电流能在一定范围内变化，其电压恒定不变。重点是电流过大会击穿稳压管成永久性损坏。所以稳压管前须串限流电阻，而不是分压电阻（稳压管有固定稳压值，不受分压决定）。若限流电阻过小则电流过大会击穿稳压管。

回答2：

这个电阻的阻值一般很小

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