Thanks to everyone for explaining this to me. =20

I've been having some problems understanding the basics of electricity, and=
 I think I understand some reasons why.  When learning new things I also ha=
ve to remember to un-learn some things.

During my searching I found some great educational videos on electronics.  =
They explain very well some specific that I need to understand.

It goes into great detail, with the math that seems pretty simple, and he h=
ad a chart that you were mentioning. =20

http://www.youtube.com/watch?v=3D8xONZcBJh5A

And I think this fills in the missing information.  So I guess my real ques=
tion was the amps dial on the bench power supply.  I wondered if that was "=
dangerous".  And now I've learned a lot more what role the Amps dial plays =
in all this.  I can just figure that out based on what I'm doing.  Playing =
with motors different from powering a circuit.  I've never played with anyt=
hing that required more than 12 volts.  But if the amps are too high then s=
ometimes it can make a resistor get quite hot, I noticed.  (I wondered whic=
h would make it hotter, by increasing the amps or increasing the volts. )

I'm quite having fun figuring all this new stuff out.

Lindy
________________________________________
From: piclist-bounces@mit.edu [piclist-bounces@mit.edu] on behalf of Sean B=
reheny [shb7@cornell.edu]
Sent: 22 November 2013 08:26
To: Microcontroller discussion list - Public.
Subject: Re: [OT] Danger of DC Power Supply



Also - beware that the skin is the main insulator protecting your body.
Once that breaks down or is cut, the remaining resistance is on the order
of 10 to 100 ohms depending on the path through the body. 20 to 30mA can
prevent you from letting go and 100mA can stop your heart (even lower if
the whole current is directed through your heart more directly). Even less
than 100mA can induce fatal heart arrhythmias.

I generally try not to touch anything over 12V and I show increasing levels
of caution as the voltage rises from there.

Sean



--=20
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