Jeri's A to Z Electronics

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By Gareth Branwyn
Posted 2011/01/28 @ 8:58 pm
Category Electronics

MAKE pal Jeri Ellsworth has produced the first two in a series of A to Z electronics videos, sponsored by Adafruit. Here are A is for Ampere and B is for Battery (I think I watched too much Sesame Street as a kid).

Jeri Ellsworth’s YouTube Channel

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6 Responses to Jeri's A to Z Electronics

Maker Dino on January 29th, 2011 at 11:21 am said:

Ha!
Seriously, I’m really liking this series. You’re making it fun to learn, and I’ll bet you’re having fun making them.
Keep up the good work as always.

Give your cat a scratch on the chin for me. \^..^/

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theophrastus on January 29th, 2011 at 2:36 pm said:

Delightful! Thank you.

Will Adafruit sell a compilation DVD once you finish Z for impedance? If so, sign me up!

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- Geardaddy on January 30th, 2011 at 7:44 am said:
  
  Z can’t be inductance. By the time Z rolls around we’ll already have hit Capacitor, Inductor and Resistor. I vote Z is for Zener Diode!
  
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  Geardaddy on January 30th, 2011 at 7:46 am said:
  
  Sorry – meant impedance.
  
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amasci.com on January 29th, 2011 at 7:25 pm said:

If you see 0.85V on a home-made electric cell, it means that one electrode is zinc (or zinc plated.) Go search on info about the chemistry behind the “lemon battery.” Since fruit juice isn’t zinc chloride or copper sulfate, apparently the battery is driven by zinc oxidation, and the copper electrode doesn’t participate much in the chemistry.

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- theophrastus on January 29th, 2011 at 9:33 pm said:
  
  It’s not likely Zinc. that would give a voltage of around 1.1V with Copper (for example see: http://dl.clackamas.cc.or.us/ch105-09/calculat.htm )
  
  I would guess it’s more likely a (Cu-redox = 0.34) so: 0.34 – 0.85 -> -0.51 which is somewhere between Iron (-0.41) and Chromium (-0.74) and what do you know… many stainless steels (like many washers used in plumbing) have an Iron/Chromium mix.
  
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