求救：车10天没开，打不着了

[ccc]

懂了。说得这么详尽，弄得wo像白痴似的。

你忘记了那是蓄电池。

 

[Patio]

为什么接到电池的负极不好呢？

电池负极和engine block是相连的，所以原则上说是一样的。但是电池的两极由于氧化作用，用夹子容易造成接触不良，所以有人建议夹在engine上。实际上，自己boost不起来，专业人员来了马上就ok了，很多都是由于夹在电池上的夹子接触不良造成的，而不是专业人员或设备多牛。

 

[ccc]

弱的电池是瘸子？ 负极和engine不都是ground吗？ 区别在哪呢 太隐晦了 看不懂

你的手电，同时用一个新的电池和一个电已经快耗尽的旧电池，看看是否够亮。

负极接在engine block上，就是为了跳开那个没有电或者电快耗尽的电池。

 

[ccc]

电池负极和engine block是相连的，所以原则上说是一样的。但是电池的两极由于氧化作用，用夹子容易造成接触不良，所以有人建议夹在engine上。实际上，自己boost不起来，专业人员来了马上就ok了，很多都是由于夹在电池上的夹子接触不良造成的，而不是专业人员或设备多牛。

负极不夹在电池接线柱上，接触是否良好不是主要原因。

负极接在engine block上，就是为了跳开那个没有电或者电快耗尽的电池。

 

[enst]

那要把电池的负极断开，拧下螺丝才行吧 不然他们是接在一起的，还是背着瘸子啊

 

[Patio]

负极接在engine block上，就是为了跳开那个没有电或者电快耗尽的电池。

村长，boost与原电池无关。您老现在有点糊涂。

 

[enst]

负极接在engine block上，就是为了跳开那个没有电或者电快耗尽的电池。

避免接触不良（负极那里太小，可能外表氧化）倒是个可以理解的理由

 

[Kay007]

你的解释让我明白了

 

[lifeisfun]

都是认死理的人，照着做就行了，没有那么多十万个为啥

 

[enst]

都是认死理的人，照着做就行了，没有那么多十万个为啥

好奇心而已 因为我自己给电池充电 和搭线boost 都是直接接电池负极的成功的

 

[ccc]

那要把电池的负极断开，拧下螺丝才行吧 不然他们是接在一起的，还是背着瘸子啊

During jump-starting, we connect the boosting battery to ground rather than to the dead battery's - terminal for the simple reason that this provides a more direct return path to the good battery which is powering the dead car: the return current does not have to travel through the dead battery's minus terminal hookup cable and then to the jumper cable, but can go directly from the chassis ground to the jumper cable.

A more direct return path allows for better current flow and less voltage drop, like plugging a big appliance directly into an outlet, rather than via an extension cord.

In case you're also wondering why the plus jumper connections are made first, then the minuses. This is because there is no harm done if you leave the minus jumper dangling in the chassis of the car. Anything it accidentally touches is likely to be ground. If you connect both alligator clips on one end before connecting the other end, the other end is now live and you can accidentally touch the clips together to create a short circuit. If you connect the minuses/grounds first and then go to connect one of the pluses, you can create a short circuit, because the opposite side plus is probably dangling and touching something that is grounded.

 

[ccc]

都是认死理的人，照着做就行了，没有那么多十万个为啥

是有其道理的。只是TA不认为那样可以让电流更直接返回到那个好的电池而已。

 

[一心无住]

我认为负极接车体是为了安全，负极接电池负极，那么负极的夹子和正极夹子很近，不小心会短路的，接车体后正负极离得很远就安全多了。

 

[zeus190]

如果boosts的时候cable直接将两个电池的两极对接相当于将两电池并联了. 总输出电压就是小的那个电池的电压, 这样电压不够, 启动不了.

 

[enst]

During jump-starting, we connect the boosting battery to ground rather than to the dead battery's - terminal for the simple reason that this provides a more direct return path to the good battery which is powering the dead car: the return current does not have to travel through the dead battery's minus terminal hookup cable and then to the jumper cable, but can go directly from the chassis ground to the jumper cable.

A more direct return path allows for better current flow and less voltage drop, like plugging a big appliance directly into an outlet, rather than via an extension cord.

In case you're also wondering why the plus jumper connections are made first, then the minuses. This is because there is no harm done if you leave the minus jumper dangling in the chassis of the car. Anything it accidentally touches is likely to be ground. If you connect both alligator clips on one end before connecting the other end, the other end is now live and you can accidentally touch the clips together to create a short circuit. If you connect the minuses/grounds first and then go to connect one of the pluses, you can create a short circuit, because the opposite side plus is probably dangling and touching something that is grounded.

貌似有点道理
电的传输速度非常快的 那样一点距离就more direct了，不知道是有根据的还是想象的