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养狗的一定要进来看看，超级搞笑的

养狗的一定要进来看看，超级搞笑的# pets - 心有所宠

S*s2011-05-24 07:05

1 楼

【以下文字转载自 Joke 讨论区】
发信人: StarVenus (参商*极品磨工), 信区: Joke
标题: 在学术版问一个幼儿电路题
发信站: BBS 未名空间站 (Sat Mar 16 20:51:35 2013, 美东)
如图，儿子的玩具，电路很简单，一个发电机，一个电风扇，一个发光二级管，一个导
线，串联。
如果顺时针摇发电机，发光二级管亮，电扇不转
如果逆时针摇发电机，发光二级管不亮，电扇转
为什么？

x*g2011-05-24 07:05

2 楼

不知道怎么贴YOUTUBE，给个连接吧，同时求贴YOUTUBE方法
http://www.youtube.com/watch?v=nGeKSiCQkPw

S*s2011-05-24 07:05

3 楼

nobody give a clue?
it looks to me they should be on at same time

i*s2011-05-24 07:05

4 楼

被贴了三次了
看一次笑一次

【在 x****g 的大作中提到】

: 不知道怎么贴YOUTUBE，给个连接吧，同时求贴YOUTUBE方法
: http://www.youtube.com/watch?v=nGeKSiCQkPw

k*a2011-05-24 07:05

5 楼

发光二级管 is one direction only

m*i2011-05-24 07:05

6 楼

哈哈哈～～～太好玩儿了～～～

【在 x****g 的大作中提到】

: 不知道怎么贴YOUTUBE，给个连接吧，同时求贴YOUTUBE方法
: http://www.youtube.com/watch?v=nGeKSiCQkPw

k*a2011-05-24 07:05

7 楼

"如果逆时针摇发电机，发光二级管不亮，电扇转"
This does not seem right, the 发光二级管 can only allow very small currents
passing through if it is connected in the wrong direction, unless the
voltage is too high then 发光二级管 is damaged
Are you sure they are 串联?

I*e2011-05-24 07:05

8 楼

yeah...it made me laugh..AGAIN.

【在 x****g 的大作中提到】

: 不知道怎么贴YOUTUBE，给个连接吧，同时求贴YOUTUBE方法
: http://www.youtube.com/watch?v=nGeKSiCQkPw

n*y2011-05-24 07:05

9 楼

是，我记得二极管是单方向通电。

【在 k******a 的大作中提到】

: 发光二级管 is one direction only

g*a2011-05-24 07:05

10 楼

还好我儿子玩的电路里没有二极管

s*l2011-05-24 07:05

11 楼

你确定是串联吗？

【在 S*******s 的大作中提到】

: nobody give a clue?
: it looks to me they should be on at same time

f*r2011-05-24 07:05

12 楼

线接错了？:-)

s*g2011-05-24 07:05

13 楼

Connected in parallel.
In one direction, the diode has almost no resistance, so all current goes
through it. In the other direction, the diode has very large resistance, so
current goes through lightbulb.

n*y2011-05-24 07:05

14 楼

so
～～～～电扇？

【在 s*****g 的大作中提到】

: Connected in parallel.
: In one direction, the diode has almost no resistance, so all current goes
: through it. In the other direction, the diode has very large resistance, so
: current goes through lightbulb.

S*s2011-05-24 07:05

15 楼

from the pic, how can you claim "Connected in parallel"?

so

【在 s*****g 的大作中提到】

s*l2011-05-24 07:05

16 楼

但是也看不出来是串联。
要看到实际的连线才行。背面放个图。

【在 S*******s 的大作中提到】

: from the pic, how can you claim "Connected in parallel"?
:
: so

n*y2011-05-24 07:05

17 楼

You can draw one, and will see that parallel works, but sequential doesn't.

【在 S*******s 的大作中提到】

: from the pic, how can you claim "Connected in parallel"?
:
: so

f*r2011-05-24 07:05

18 楼

我想大家是这么想的，when you have eliminated the impossible,
whatever remains, however improbable, must be the truth..

S*s2011-05-24 07:05

19 楼

no. it is 串联. parallel can not be constructed with 4 components, 2
connectors each, i guess.

【在 s***l 的大作中提到】

: 但是也看不出来是串联。
: 要看到实际的连线才行。背面放个图。

n*y2011-05-24 07:05

20 楼

Sequential doesn't work, the diodes only passes current in one direction. If
sequential, nothing happens if you turn the wheel in one direction, and
both thing come on when you turn it the other direction.

【在 S*******s 的大作中提到】

: no. it is 串联. parallel can not be constructed with 4 components, 2
: connectors each, i guess.

g*o2011-05-24 07:05

21 楼

这是幼儿题啊？
是不是二极管同时并联了个电阻啊，然后这两个再和电扇串联
当电流方向对的时候，二极管亮，但电扇电流不够？
电流方向反的时候，电扇转，但二极管阻力大，就从那个并联的电阻上过去了？
猜得，八成儿不对啊

【在 S*******s 的大作中提到】

: no. it is 串联. parallel can not be constructed with 4 components, 2
: connectors each, i guess.

S*s2011-05-24 07:05

22 楼

you are so right. now you understand why I ask?

If

【在 n****y 的大作中提到】

: Sequential doesn't work, the diodes only passes current in one direction. If
: sequential, nothing happens if you turn the wheel in one direction, and
: both thing come on when you turn it the other direction.

n*y2011-05-24 07:05

23 楼

It should be on at the same time IF it is sequential; now, obviously that is
not the case, which means the circuitry is not sequential.

【在 S*******s 的大作中提到】

: you are so right. now you understand why I ask?
:
: If