复杂直流电路

复杂直流电路

一、选择题(每题分，计分)

1.基尔霍夫电流定律指出，流经电路中任何一节点的电流的 ·································· ( )

A. 代数和等于零

B. 矢量和等于零

C. 代数和大于零

D. 矢量和大于零

2.电路中，任一瞬时流向某一点电流之和应( ) 由该节点流出的电流之和

A. 大于

B. 小于

C. 等于

D. 都不对

3.基尔霍夫电流定律的数学表达式为 ································································ ( )

A. I=U/R

B. ∑IR =0

C. ∑u=0

D. ∑I=0

4.基尔霍夫电压定律指出，任何时刻任一个闭合回路中各段电压的························· ( )

A. 代数和等于零

B. 矢量和等于零

C. 代数和大于零

D. 矢量和大于零

5.叠加原理是分析( ) 的一个重要原理。

A. 简单电路

B. 复杂电路

C. 线性电路

D. 非线性电路

6.在图中电路的支路数为 ··············································································· ( )

A. 3

B. 4

C. 5

D. 6

7.叠加定理只适用于 ····················································································· ( )

A. 交流电路

B. 直流电路

C. 线性电路

D. 三种都适用

8.在图所示电路中，I1和I 2的关系是································································ ( )

A. I1>I2

B. I1

C. I1=I2

D. 不能确定

9.基尔霍夫第二定律是研究电路( ) 之间关系的

A. 电压与电流

B. 电压与电阻

C. 电压、电流、电阻

D. 回路电压与电动势

10.在计算线性电阻电路的电压和电流时，可用叠加定理，在计算线性电阻电路的功率时叠加定理······································································································· ( )

A. 可以用

B. 不可以用

C. 有条件地使用

D. 以上都不对

11.在图中，R1阻值减小时，则： ···································································· ( )

A. 电压源E产生的电功率将减小

B. 电压源E产生的电功率将增大

C. 电压源E消耗的电功率将减小

D. 电压源E消耗的电功率将增大

12.基尔霍夫电流定律是研究电路( ) 之间关系的

A. 电压与电流

B. 通过节点的各电流

C. 电压、电流、电阻

D. 回路电压与电动势

13.判断图所示(a )(b )(c)(d)电路中等效的电路为 ·················································· ( )

A. (a)和(b )

B. (a)和(c)

C. (c)和(d)

D. (b)和(c)

14.图所示电路中，电流I等于 ········································································ ( )

A. -2A

B. 0A

C. 2A

D. 1A

15.图示电路中电流I为 ················································································· ( )

A. 5V

B. -15V

C. -5V

D. 15A

16.图示电路中，电流表正负接线端用“+”、“-”号标出。今电流表指针正向偏转,读数10A，有关电流、电压方向也表示在图中，则( ) 正确

A. I1=10A，U=-6V

B. I1=-10A，U=6V

C. I1=10A，U=12V

D. I1=-10A，U=12V

17.图所示电路中，电位器R P1的滑动端向下移动及R P2的滑动端向右移动时，电流I1、I2的变化趋势是································································································· ( )

A. I1减小、I2增大

B. I1增大、I2减小

C. I1不变、I2减小

D. I1减小、I2增大

18.图中的电流I为 ······················································································· ( )

A. -1A

B. 1A

C. 2A

D. 3A

19.图4所示电路中，判断电阻R中流通的电流及消耗的功率为 ····························· ( )

A. 0A，2W

B. 1A，2W

C. 1A，4W

D. 0A，0W

20.图3所示电路中，判断电阻R中流通的电流及消耗的功率为 ····························· ( )

A. 1A，2W

B. 2A，4W

C. 2A，2W

D. 0A，0W