高中物理逻辑电路

2025-04-06 11:39:36
推荐回答(1个)
回答1:

a 是错误的 此逻辑电路只有一个输入端为非门 输入高电平的时候 输出低电平 输入低电平的时候 输出高电平 无光照在R’时 R'的值很大 R'远远大于R 此时 5v的电压在两个电阻上分压
在R'上分得最多 可以认为几乎是由R'分得了所有电压 即输入端接近5v 高电平 输出为低电平
电灯两端都为低电平 没有电势差即电压 无法提供电灯工作 当有光照时R'的电阻迅速减小 以至于R远远大于R' R上几乎分得了所有电压 此时 输入电压 接近0v 为低电平 输出高电平 灯l两端有高低电平 有电势差即电压 能正常工作

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