Which resistor has the smallest resistance at V1?
A
B
C
D
Which resistor is filament lamp?
A
B
C
D
When the switch is closed, what is the ratio of the reading on ammater X and Y?
1:1
1:2
2:1
3:2
3:1
开关闭合，Assume R=6Ω，what is the total resistance of this circuit?
Calculate the current I in the circuit
Calculate the e.m.f
2:1
8:1
1:2
1:8
1:32
32:1
电压和下列哪一项最有关联？
电流
电阻
电能
电功率
元电荷量等于下列哪一个数字
1.6*10-19
1.6*10-18
1.6
1
Which one must not a charge carrier(带电体)?
1.6*10-19
0
4.8*10-19
5.4*10-19
电场的定义和下列哪一项无关？
一片区域
任何物体
受到静电力
方向任意
重力场，电场，磁场，三者的共同点是？
一片区域
任何物体
受到磁力
方向任意
A
B
C
D
A total charge of 1000 C moves through 100 Ω resistor in a time interval of 10s, calcualte the current flow across the resistor.
10000
1000
100
10
1
When the switch is closed, what is the ratio of the reading on ammater X and Y?
1:1
1:2
2:1
3:2
3:1
开关闭合，Assume R=6Ω，what is the total resistance of this circuit?
Assume conductor A and B are made by same material. The ratio of cross-sectional area of A and B is 1:4. What is the ratio of diameter of A and B?
1:2
2:1
4:1
condition is not enough
1:4
(同材料，A,B截面积比1:4). Assume the temperature is constant and length of A and B are same, what is the ratio of resistance of A and B?
1:2
2:1
4:1
condition is not enough
1:4