Very very elementary electronics questions

[fungus]

On Jan 5, 12:29 pm, "Phil Allison" <phi...@tpg.com.au> wrote:

"fungus = retarded fuckhead

Your conclusion is right but the reasoning is wrong.

** His reasoning is 100% spot on   - you asinine POS.

    Fuck OFF  !!!

    LUNATIC  !!!!!

I hope this is just a communication problem
because you seem to be telling us his widget
is actively pulling electrons from the power
supply.

It isn't. An electrical device is just a pathway
for electrons to travel from a place of higher
potential to a place of lower potential. It plays
no role in moving those electrons (quite the
opposite in fact - it resists their movement).

The original statement about a device "drawing
amps" is ass-backwards.

A better way to think about it is that a device
allows a certain amount of current to pass though it.

It doesn't matter whether a 1 amp device is connected
to a 1 amp power supply or a 1 million amp power
supply. Only a certain amount of current can pass.

The amount of current that can pass depends on the
electrical resistance of the device and the power
supply's voltage. It obeys Ohm's Law.

 

[fungus]

On Jan 7, 1:21 pm, "Phil Allison" <phi...@tpg.com.au> wrote:

"fungus =  retarded fuckhead

** His reasoning is 100% spot on   - you asinine POS.

    Fuck OFF  !!!

    FUCKING  LUNATIC  !!!!!

Your resistors are actively pulling electrons
out of things? Our energy problems are over,
and it's all thanks to Phil!

 

[P E Schoen]

"Ecnerwal" wrote in message
news:MyNameForward-1AE84E.13414804012012@news.eternal-september.org...

On the web - not quite as good as AoE in my opinion, but handy and
not a crock...or spam-laden ad site. Obviously it's eventually focussed
on the stuff used in the related course, but seems pretty decent on
a quick skim-through.

http://www.clear.rice.edu/elec201/Book/basic_elec.html

Another fairly good source of basic information is:
http://www.allaboutcircuits.com/

And also:
http://openbookproject.net/electricCircuits/
(which I think preceded the allaboutcircuits site and "borrowed" material
from it)

If your interests tend toward radio, TV, and other RF devices, here is an
ancient favorite:
http://www.arrl.org/news/the-i-2010-arrl-handbook-i-our-biggest-and-best-ever

I found it most helpful to actually build and test circuits. There are still
some kits and trainer modules that provide this, such as:
http://www.amazon.com/Snap-Circuits-SC-750R-Student-Training/dp/B000IXMP6Q

You can also learn a lot by developing and playing with circuits using
LTSpice, which is a free application with which you can make schematics and
run simulations and see circuit performance graphically:
http://www.linear.com/designtools/software/

Another free simulator package is TINA, which you can get through
www.ti.com, or www.tina.com

Here's a video:
http://www.youtube.com/watch?v=7j5QLQ0yzn0

It has user interactive components such as switches, pots, and LED displays,
plus test instruments like scopes and multimeters. It also has a PCB design
module.

The simulator approach is safer than building actual circuits, but it is
sometimes more fun and memorable to build and test actual hardware. Just be
careful with voltages about about 24V, and wear eye protection in case a
capacitor explodes (which can happen even on low voltage battery projects.

Have fun!

Paul

Paul