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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