A.使加给它两端的电压减小一半 |
B.使它的电阻减小一半 |
C.让通过它的电流减小一半 |
D.使它的电阻和两端的电压同时减小一半 |
U2 |
R |
1 |
4 |
U2 |
R |
1 |
2 |
1 |
4 |
U2 |
R |
1 |
2 |
A.P甲>P乙 | B.P甲<P乙 | C.P甲=P乙 | D.无法确定 |
A.110W | B.1100W | C.5000W | D.550W |
A.0.25W | B.0.5W | C.1W | D.2W |
A.9V | B.12V | C.18V | D.6V |
A.两只灯泡均被烧坏 |
B.两只灯泡均完好 |
C.15W的灯泡烧坏,100W的灯泡完好 |
D.100W的灯泡烧坏,15W的灯泡完好 |
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