电阻电路的等效变换 Flashcards

1
Q

电路等效基本知识:

A
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2
Q

并联电路电导公式:

A
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3
Q

并联电路电流分配(利用电导):

A
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4
Q

求等效电阻例题:胳膊电路中的电流=0

A
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5
Q

求等效电阻例题:

A
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6
Q

求等效电阻例题 :需要合并点

A

怎么合并点呢?
合并从电源正极出发,两个(或多个)方向都能到达的点

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7
Q

电桥 / 惠斯通电路 :电阻大小的计算

A
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8
Q

电桥 / 惠斯通电路 :平衡条件

A
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9
Q

Y形、三角形电路之间的相互等效:

A

口诀:外3内1

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10
Q

Y形、三角形电路等效:电阻计算公式

Y->三角:公式可以进一步推导,见图1

A

记住:
1.算转换成三角,电阻会变大,分母比分子大;
2.用电导算就反过来

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11
Q

Y形、三角形电路等效例题:计算三角->Y形

A
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12
Q

惠斯通电桥平衡推广:

A
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13
Q

例题:利用惠斯通电桥平衡求电阻

A

提示:
1.相同电动势之间接电阻可以忽略;
2.电桥平衡时,电阻间存在比例关系(因为电桥平衡本质是:各支路电压降低的比例相同)

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14
Q

实际电压源伏安特性:

A
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15
Q

实际电压源:理想情况是什么?

A

但是不能短路

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16
Q

实际电流源伏安特性:

A

短路电流(实际电压源)
断路电压(实际电流源)

17
Q

实际电流源:理想情况是什么?

A

但是不能出现开路

18
Q

实际电压源、实际电流源的转换:

A

注意:电流方向一定是从-到+

19
Q

实际电压源、实际电流源的转换例题:实际电流源->实际电压源

20
Q

实际电压源、实际电流源的转换例题:实际电压源->实际电流源

A

小知识:跟理想电压源并联的元件失效,跟理想电流源串联的元件失效

做着题犯过的错误:最左端随意假定了一个方向,导致kcl出错

21
Q

实际电压源、实际电流源的转换例题:

22
Q

实际电压源、实际电流源的转换例题:

23
Q

实际电流源、实际电压源等效变换例题:(理解这题红圈的变换)

24
Q

等实际电流源、实际电压源等效变换例题:

25
Q

化简电路例题:

26
Q

进一步化简电路例题:公式法(KVL)

27
Q

例题:求外加电阻

28
Q

错题:三角型、Y型电阻的等效