U |
R1 |
U |
R2 |
U |
R3 |
1 |
2 |
1 | ||
|
1 |
R3 |
5 |
R1 |
1 |
3 |
U |
R1+R2+R3 |
U | ||||
R1+
|
U | ||
|
U | ||
|
U |
R1 |
A.若①②为电流表,③为电压表,则甲灯比乙灯亮 |
B.若①③为电压表,②为电流表,则乙灯比甲灯亮 |
C.若①②为电压表,③为电流表,则乙灯比甲灯亮 |
D.若①③为电流表,②为电压表,则乙灯比甲灯亮. |
A.R2:R3=3:2,U=9 V | B.Rl:R2=1:3,2P1=3P2 |
C.Rl=2Ω,P2=27W | D.U=18V,P1=40 W |
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