测验1

1、单选题：
‎It is conventional to take the current flow as the movement of                .‌
选项：
A: negative charges
B: positive charges
C: any charge
D: protons
答案: 【 positive charges】

2、单选题：
‌Electric current is the time rate of charge,measured in               .‎
选项：
A: watts
B: volts
C: joules
D: amperes
答案: 【 amperes】

3、单选题：
‏The energy required to move a unit charge through an element is              .‏
选项：
A: current
B: power
C: voltage
D: potential
答案: 【 voltage】

4、单选题：
‏The plus (+) and minus (-) signs in an electric circuit diagram are used to define               .‍
选项：
A: voltage polarity
B: current direction
C: power flow
D: absorbed power
答案: 【 voltage polarity】

5、单选题：
‎According to the passive sign convertion, if the power has a plus sign, power is             by the element.​
选项：
A: supplied
B: absorbed
C: generated
D: transferred
答案: 【 absorbed】

测验2

1、单选题：
‍An independent voltage source is a            , which maintains a specified voltage between its terminals.‍
选项：
A: one-terminal element
B: two-terminal element
C: three-terminal element
D: four-terminal element
答案: 【 two-terminal element】

2、单选题：
‎Resistors are            elements.‍
选项：
A: passitive
B: active
C: independent  source
D: dependent  source
答案: 【 passitive】

3、单选题：
‍An ideal dependent source is an              elemenet in which the source quantity is controlled by another voltage or current.‍
选项：
A: passitve
B: active
C: independent
D: inductive
答案: 【 active】

4、单选题：
‍There are              possible types of dependent sources.‎
选项：
A: two
B: three
C: four
D: five
答案: 【 four】

5、单选题：
‍For a voltge source , its terminal voltage is known but its                must be determined by the external circuit connecting with it.   ​
选项：
A: electromotive force
B: current
C: control coefficient
D: polarity
答案: 【 current】

测验3

1、单选题：

‎

​选项：
A:
B:
C:
D:
答案: 【 】

2、单选题：

‍

‏选项：
A:
B:
C:
D:
答案: 【 】

3、单选题：

‏