l1 |
v |
0.6 |
1.2 |
0.3×3 |
2 |
1 |
2 |
1 |
2 |
ε |
R总 |
0.09 |
0.9 |
1 |
2 |
1 |
2 |
. |
ε |
△ϕ |
△t |
B•△S |
△t |
B×
| ||||||
|
. |
ε |
ε |
2 |
0.09 |
2 |
x |
2 |
x |
2 |
xr•(l1-x)r |
l1r |
x(l1-x) |
l1 |
ε′ |
R外+r′ |
| ||||
|
Bl1v |
2(l1-x)r+l1r |
Bl1v |
(3l1-2x)r |
0.12 |
1.8-2x |
0.12 |
1.8-2×0.6 |
A.三个灯泡的额定电压相同,额定功率不相同 |
B.三个灯泡的额定电压不相同,额定功率相同 |
C.三个灯泡中,B灯的电阻最大,C灯电阻最小 |
D.当滑片P向左滑动(各灯仍能发光)时,A灯和C灯变亮,B灯变暗 |
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