[经验]

品尝力量：实验1

2018-10-30 14:28:50

897 万用表

在获得第二版“Make：Electronics”之后，我决定尝试本书中提供的所有实验。
本书的第一个挑战是舔9伏电池。
你问为什么这是一个挑战？
试试吧！
我已经读过一些其他人对这个实验的描述，他们说他们几乎感觉不到任何东西，但是我觉得这样！
在我的舌头干燥并重复该过程之后，它不那么不舒服，但仍然可以完全检测到。
测量你的舌头
我的万用表的读数都高于本书所建议的读数。
我确实得到了实验的结论，即我湿润的舌头的较低阻力允许更多的电流流过它，这就是为什么当我的舌头干燥时感觉较弱的原因。
进一步的调查
我收集了一些关于手臂皮肤抵抗力的更多信息，如下表所示。
测量手臂皮肤的阻力时，如上图所示标记手臂，这样您就知道将探头放在皮肤上的位置，以便从万用表中获得正确的读数。
最后，我测量了自来水的阻力，如下图所示。
添加的盐会大大减少阻力！
背景：发现抵抗的人
ARD（德意志联邦共和国公共服务广播协会）称之为“Meilensteine der Naturwissenschaft und Technik”。
关于乔治·西蒙欧姆的这一集完美地补充了本书的这一部分。
这一集可以在YouTube上以英语，德语和西班牙语找到。
如果您想自己重新创建这个实验，您可以从Digi-Key获得此实验所需的一切！
电池9 V
万用表 - FLIR的EXTECH EX330万用表（我使用过的）
其他万用表
PCB标尺

以上来自于谷歌翻译

以下为原文

After getting the second edition of “Make: Electronics”, I decided to try all of the experiments presented in the book. The first challenge in the book is to lick a 9 V battery. Why is it a challenge you ask? Try it!
I’ve read some other people’s accounts of this experiment in which they say they barely felt anything, but oh did I feel it!

After drying my tongue and repeating the process, it was less uncomfortable, but still perfectly detectable.
Measuring Your Tongue

My multimeter’s readings were both higher than what the book suggested they would be.
I did get the experiment’s conclusion that the lower resistance of my moist tongue allowed more current to flow through it and that’s why the sensation was weaker when my tongue was dry.

Further Investigation

I gathered some more information about the resistance of the skin on my ARM as shown in the next table.

When measuring the resistance of the skin on your arm, mark your arm as shown in the picture above so you know where to place the probes on your skin to get the right readings from your multimeter.
Finally, I measured the resistance of tap water as shown in the next photo.

The added salt dramatically diminished the resistance!

Background: The Man Who Discovered Resistance

There’s a great series from the ARD (Association of Public Service Broadcasters of the Federal Republic of Germany) called “Meilensteine der Naturwissenschaft und Technik”.
The episode about Georg Simon Ohm perfectly complements this section of the book.
This episode can be found on YouTube in English, German, and Spanish.
If you would like to recreate this experiment yourself, you can get everything you need for this experiment from Digi-Key!