R1 |
R2+R2+r |
3 |
3+1+1 |
R1R2 |
R1+R2 |
3×6 |
3+6 |
E |
R+r |
10 |
4+1 |
R1 |
R1+R2 |
5 |
6 |
A.S断开时,R1与R2的功率之比为1:5 |
B.S闭合时通过R1与R2的电流之比为2:1 |
C.S断开与闭合两情况下,电阻R1两端的电压之比为2:1 |
D.S断开与闭合两情况下,电阻R2的功率之比为7:12 |
A.Va<Vb | B.Ia<Ib | C.
| D.
|
A.E=5.76V,r=0.4Ω | B.E=5.76V,r=0.8Ω |
C.E=6.12V,r=0.4Ω | D.E=6.12V,r=0.8Ω |
A.小于4V | B.大于4V |
C.等于4V | D.等于或大于4V |
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