A.3只“6V,0.8W”和2只“6V,1.2W”的灯泡分别并联,然后串联,4.8W |
B.2只“6V,0.8W”和3只“6V,1.2W”的灯泡分别并联,然后串联,5.2W |
C.1只“6V,0.8W”和4只“6V,1.2W”的灯泡分别并联,然后串联,5.6W |
D.4只“6V,0.8W”和1只“6V,1.2W”的灯泡分别并联,然后串联,4.4W |
U2 |
P1 |
(6V)2 |
0.8W |
U2 |
P2 |
(6V)2 |
1.2W |
45Ω |
n |
30Ω |
5-n |
A. | B. | C. | D. |
A. | B. | C. | D. |
A. | B. | C. | D. |
A. | B. | C. | D. |
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