did National semi not give demos with oranges? I remeber some of these
reps went around to give demos of low current devices. used 3 or four
oranges connected together to provide enough power to run a micro.
> Any suggestion on how to build a battery from household material able to
> power up an LED for a school project? ( Very preferable without caustic > chemicals).
> ---> Beware the man of one book!
I appreciate all the suggestions, but I am afraid that they will not
work. I should have specified what type of LED. White LED: forward
voltage 3.6V @20mA. BTW I am not the student, but I was a student just
50 years ago!
| I appreciate all the suggestions, but I am afraid that they will not
| work. I should have specified what type of LED. White LED: forward
| voltage 3.6V @20mA. BTW I am not the student, but I was a student just
| 50 years ago!
Two dissimilar pieces of metal plate (coins) pushed into fruit (orange,
lemon), wire several in series to produce more voltage.
> I appreciate all the suggestions, but I am afraid that they will not
> work. I should have specified what type of LED. White LED: forward
> voltage 3.6V @20mA. BTW I am not the student, but I was a student just > 50 years ago!
> ---> Beware the man of one book!
Caustic chemicals are the best part of batteries. I don't think you can
actually *have* a battery without caustic chemicals.
OK, strictly speaking, sulfuric acid isn't caustic, it's acidic...but
you didn't want to just avoid
lye, did you?
As a demo in high school chem I took some lead flashing, cut it into
strips, stuck it into a 250 ml beaker full of dilute sulfuric acid,
charged it for a while, and then connected it to a 2 V pilot lamp which
lit quite nicely. You'd need at least two in series for a white LED -
probably 3. And it's a rechargeable battery, too.
No problem. Take one of those compartmentalized plastic boxes with
molded in partitions (each area holds water without leaking to the
Get some aluminum and copper flashing material. Cut the metal into
rectangles or squares so that they fit down into the compartments and
protrude ~1/2" or so.
Punch matching holes in both metals where they extend above the
compartments and use some machine screws and nuts to fasten them. So
you have tiny sheets of copper and aluminum fastened together at one
end (a crimp, fold, or sometimes the punched hole will be enough to
make a connection but a bolt lasts longer)
Slide the prepared plates of the battery into a pair of compartments
over the partitioning plastic so that you have aluminum in one copper
in the other and each compartment has both.
Fill compartments with electrolyte (lemon juice, salt water, or other
weak electrolyte) Connect end plates to the LED. We powered a simple
three transistor radio with one cell back in the days of germanium
point contact transistors. I think we were getting about .5 volts per
cell in the multiple batteries. I never measured the current output.
Try different electrolytes Lemon juice or vinegar work well.
Not really. Oxygen causes more corrosion than any other substance
on Earth. And don't get me started on Dihydrogen Monoxide, the
(Note to the humor impaired: please consider the possibilitly that
Bill and I are just having some fun here before firing up the
Hydrogen Hydroxide is your friend!
Perhaps you've heard of it: a colorless, odorless liquid; a
powerful coolant and solvent; an easily- synthesized compound
which is used by industry, the military, commercial operations,
and even private individuals.
Yes, we are talking about hydrogen hydroxide, also known as
Dihydrogen Monoxide, and we are here to tell you that what
you've heard about DHMO is probably not the whole truth.
There are forces out there, such as the Coalition to Ban
Dihydrogen Monoxide, who would seek to legislate its use
and availability, placing heavy limitations on it-- and
eventually, eradicating it entirely.
In the interest of fairness, we invite you to see their
argument, and then we urge you to return here, to learn
the truth. Their subversive agenda must not be allowed
Hydrogen hydroxide is beneficial!
It has been shown that hydrogen hydroxide enhances the
functionality, growth, and health of many forms of
life-- including humans!-- and current research suggests
that it has become an integral part of our planet's
Hydrogen hydroxide is environmentally safe!
Opponents of dihydrogen monoxide would have you believe
that it is some kind of uber-toxin, that it wreaks caustic
terror on anything it touches. This couldn't be farther
from the truth; when handled properly, it enhances nature
rather than destroys it, and even a worst-case scenario
DHMO accident would be a trifle for the natural cycles of
our world to handle.
Hydrogen hydroxide is benign!
The Coalition and others have popularized the label "dihydrogen
monoxide" over the more chemically-accurate "hydrogen hydroxide"
because they know how loaded the former name is. "Monoxide" has
become synonymous with pollution, toxic gases, industrial
waste-- and while hydrogen hydroxide is sometimes a factor
in these problems facing our world today, it is rarely the
Hydrogen hydroxide occurs in nature!
To hear its naysayers' descriptions, one would think hydrogen
hydroxide was solely the product of industrial technology;
that it came from years of research in clandestine labs. This
is not the case! Hydrogen hydroxide has been a part of nature
longer than we have; what gives us the right to eliminate it?
We need hydrogen hydroxide!
Don't let an uneducated and terror-stricken mob of fanatics
railroad you into giving up your right to choose!
Support the use and distribution of hydrogen hydroxide in your
neighborhood, city, state, and country!
Brought to you by the Friends of Hydrogen Hydroxide and the
Scorched Earth Party. Those interested in joining our cause,
or simply interested in learning more about hydrogen hydroxide,
its uses and benefits, and those who are trying to ban it,
should send mail to firstname.lastname@example.org.