P额 |
U额 |
E-U额 |
(r+R1+R2)P额/U |
250-200 |
(0.5+1+1)1000/200 |
| ||
P额n′ |
| ||
(r+R1+R2)P额 |
2002 |
(0.5+1+1)×1000 |
′ | 2总 |
E2R1 |
[2(r+R1+R2)]2 |
2502×1 |
[2×(0.5+1+1)]2 |
′ | 2总 |
E2r |
[2(r+R1+R2)]2 |
2502×0.5 |
[2×(0.5+1+1)]2 |
A.在b点时,电源有最大输出功率 |
B.在b点时,电源的总功率最大 |
C.从a→b时,β角越大,电源的总功率和输出功率都将增大 |
D.从b→c时,β角越大,电源的总功率和输出功率都将增大 |
A.随着所加电压的增大,小灯泡的电阻减小 | ||
B.对应P点,小灯泡的电阻为R=
| ||
C.对应P点,小灯泡的电阻为R=
| ||
D.对应P点,小灯泡的电阻为R=
|
A.0.1A | B.0.31A | C.3.18A | D.5A |
© 2017-2019 超级试练试题库,All Rights Reserved.