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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Emma Marris: Nature is everywhere — we just need to learn to see it | TED Talk | TED.com

How do you define “nature?” If we define it as that which is untouched by humans, then we won’t have any left, says environmental writer Emma Marris. She urges us to consider a new definition of nature — one that includes not only pristine wilderness but also the untended patches of plants growing in urban spaces — and encourages us to bring our children out to touch and tinker with it, so that one day they might love and protect it.

How to Keep Your Phone Battery Charged Longer

The new iPhone is slimmer and faster than ever. But like most new generations of smartphones, its battery has pretty much stayed the same over the years. Short of carrying an external battery all the time, is there any way to extend the life of your smartphone battery? In the latest Reactions episode, we explain the chemistry of lithium-ion batteries, why they occasionally explode, and share some tips to get the most from that smartphone battery.

 
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SciNews, Sunday, September 25, 2016

Students sometimes sabotaged; nicotine could have some benefits; activity trackers don’t help in weight loss; foamy beer and spillage; teleportation across Calgary; robots taking jobs; mystery of giant space blobs – 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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Anthony Goldbloom: The jobs we’ll lose to machines — and the ones we won’t | TED Talk | TED.com

Machine learning isn’t just for simple tasks like assessing credit risk and sorting mail anymore — today, it’s capable of far more complex applications, like grading essays and diagnosing diseases. With these advances comes an uneasy question: Will a robot do your job in the future?