大学MOOC 电工电子学(ElectricandElectronics)(江苏大学)1454433171 最新慕课完整章节测试答案
1.Basicconceptsandbasiclawsincircuit
Testforchapter1
1、单选题：
the reference directions and results are as shown in the circuit. someone changes the reference direction of current to opposite one , then what are the results for voltage and current.
选项：
A: Vb=12V, ib=-1A
B: Vb=-12V, ib=1A
C: Vb=12V, ib=1A
D: Vb=-12V, ib=-1A
答案: 【 Vb=12V, ib=-1A】
2、单选题：
Calculate the power for element B shown in circuit as figure1, and determine it is source or sink.
选项：
A: -12W, source
B: 12W, source
C: -12W, sink
D: 12W, sink
答案: 【 -12W, source】
3、单选题：
The equivalent resistance of the circuit in Figure is（ ）
选项：
A: R1//(R2+R4//R3）
B: R1//R2+R4//R3
C: R1+R2+R4//R3
D: R1+R2+R3+R4
答案: 【 R1//(R2+R4//R3）】
4、单选题：
as the figure, The relation between the current I1 and I2 is ( )
选项：
A: I1+ I2 =1
B: I1+1 =I2
C: I1=I2 +1
D: I1+I2 =-1
答案: 【 I1+1 =I2 】
5、单选题：
As shown in figure, which expression is not correct
选项：
A: va=vb
B: va=vc
C: vb=-vc
D: va=-vc
答案: 【 va=vc】
6、填空题：
Find the current i as shown in the circuit.
答案: 【 2A】
7、填空题：
Find R in the circuit if v2 =8V.
答案: 【 6Ω】
8、填空题：
Find the current I shown