A.9W4Ω | B.9W8Ω | C.4W4Ω | D.4W8Ω |
UL |
UR |
I1RL | ||
I1×
|
RL | ||
|
6V |
6V |
1 |
1 |
I1 |
I2 |
RL+R | ||
RL+
|
RL+2RL | ||
RL+
|
3 |
2 |
UL |
UL′ |
I1RL |
I2RL |
I1 |
I2 |
3 |
2 |
2 |
3 |
2 |
3 |
U2 |
R |
(UL′)2 |
PL′ |
(4V)2 |
4W |
(UL)2 |
RL |
(6V)2 |
4Ω |
A.观察灯丝的粗细,灯丝较粗的额定功率较小 |
B.观察名牌上的功率值,功率值大的额定功率就大 |
C.将两灯串联在照明电路中,灯泡较亮的其额定功率较大 |
D.将两灯并联在照明电路中,灯泡灯泡较亮的其额定功率较大 |
A.3W 12V | B.6W 9V | C.1.5W 12V | D.3W 9V |
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