| Chronology | Current Month | Current Thread | Current Date |
| [Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
Well, 28 amps may be gross, but a AA pack casually dropped into one's
pocket, can short circuit across a quarter (for instance) thereby
causing a burn on the leg in addition to some melted plastic threads.
At 8:36 PM -0800 on 2/9/02, Bernard Cleyet wrote
That's gross 28 Amps!!
Ludwik Kowalski wrote:
Thanks Aaron, I did not know that I=28 A can possibly be
squeezed out of a new D battery. It means that its internal r is
initially as small as 0.05 ohms. A battery rated for 15 ampere-
hours would be able to supply such current for nearly 30 min,
if r remained constant.
Does anybody know what how quickly r increases as the
function of the charge delivered (ampere-hours)? For example,
can the current be still as large as 10 or 20 A after a charge of
about 10 ampere-hours has been taken out (that is after 2/3 of the
rated ability). I guess a student-oriented "technological research"
project can be formulated to answer questions of that kind.
Ludwik Kowalski
Aaron Titus wrote:
> FYI
>
> When I write homework problems for my physics class, I try to choose
> somewhat realistic situations with realistic data. For instance, if I'm
> giving a Newton's second law problem where students analyze the
forces on a
> tennis ball, I try to give the mass of an actual tennis ball. A useful
> site for finding some of this data is at
>
> http://hypertextbook.com/facts/index-topics.shtml
--
.-. .-. .-. .-. .-. .-. .-. .-. .-. .-
\ / \ / \ N / \ C / \ S / \ S / \ M / \ / \ /
`-' `-' `-' `-' `-' `-' `-' `-' `-'
Chuck Britton Education is what is left when
britton@ncssm.edu you have forgotten everything
North Carolina School of Science & Math you learned in school.
(919) 286-3366 x224 Albert Einstein, 1936