Internal Resistance and Dry Cells

batteries

Every dry cell can be considered as being made up of two parts. Internal Resistance cannot be separated from the cell because coulombs need energy to move through any real material (including cells). Coulombs need very little energy to move through conductors. When coulombs move through loads they need (or convert to other forms or lose) more energy. The more coulombs that move through something the more energy that is converted to other forms. Another way of saying this is; the more current flowing through something the more energy is lost.

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The Physics of Space Battles – YouTube

The Physics of Space Battles

How scientifically accurate is your favorite sci-fi space battle?
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Joseph Shoer has several extensive, in-depth articles on the physics of space warfare:
http://josephshoer.com/blog/2009/12/t…
http://josephshoer.com/blog/2010/07/p…

 

SciNews, Thursday, September 29, 2016

Mouth germs team up in a bad way; frog-hunting bats adapting; the power of girls in science; results of VW emissions cheat; quantum internet; effect of ‘weather bomb’ storms – just a few of the themes in today’s eclectic collection of SciNews.  Share these stories with your students and get them excited about science.

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