CH2 电阻电路的等效变换

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Unformatted text preview: 电压和电流保持 不变的部分仅限于等效电路以外,此即“对外等效”的 概念。 3 二、电阻的Y连接和 ∆连接的等效变换 1 RY = R∆ 3 R31 R12 R12 + R23 + R31 R23 R12 R2 = R12 + R23 + R31 R23 R31 R3 = R12 + R23 + R31 R1 = R12 R1 R2 + R3 R2 + R3 R1 = R3 R31 = R1 R2 + R3 R2 + R3 R1 R2 R23 = R1 R2 + R3 R2 + R3 R1 R1 4 三、电压源、电流源的串联和并联 1、电压源的串联 us = us1 + us 2 us = us1 − us 2 5 2、电流源的并联 i s = i s1 + i s 2 i s = i s1 − i s 2 6 3、电压源和电流源的串并联 7 4、实际电压源和电流源模型的等效变换 us R0 ′ R0 = R0 is = R0 ′ R0 us = i s ⋅ Rs ′ ′ R0 = R0 8 四、输入电阻 一端口网络: 一个电路或网络...
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