Real World Coil Winding Problems
Fri Mar 10 21:12:20 PST 2000
You have nearly all the information you need to solve these problems in
this web page and in the web pages that are linked from this page.
They are hard problems. I would be shocked if any of you could
answer any of them.

If I have a 1.5 battery with .05 Ohms of resistance inside of it,
and I want to choose a resistor to get the maximum amount of energy
out of the battery and turned into heat in the resistor, how many
Ohms should the resistor be? How much energy is turned into heat
in this resistor? How hot does the resistor get? What does the
resistor look, smell, and feel like when it gets that hot?

What wire size should I use to get the highest NI for a 1.5v battery
with .05 Ohm internal resistance, where the coil is two inches tall,
one inch in diameter, and is wound around a 1/4" shaft?

How long will a Dcell alkaline battery powering the coil in problem 2
last?
Motors