I needed to start puting together resources for Junior Cert Physics, so I started with some simple ideas for teaching Electricity.
I lost it just a little at the beginning but decided to include it in case people got to thinking that all my classes are perfect – far from it.
The Science Channel have produced a wonderful learning resource on evolution here. I tried it with my Transition Year class and they found it addictive, as did my Leaving Cert Physics class when they walked in and saw it on the screen. For what is arguably the greatest idea mankind has ever come up with, there appears to be remarkably few quality resources available online.
The Welcome Trust have produced some text-based resources here (top right of page), which isn’t quite the same thing.
Is it because we as teachers are not pushing to have it taught at all levels in schools that there are so few resources out there?
Or are there resources online that I just don’t know about?
An offshoot of Joules’ Law is that when transmitting electrical power, the current is kept as low as possible in order to reduce energy losses associated with heat of the electrical cables. Because the power being transferred is the product of the voltage and the current, we can still get the same power transferred if we halve the current and double the voltage, or; make the current very, very small and make the voltage very, very big.
So power -lines transmit power at a voltage of up to 400,000 volts. Then, as the power gets closer to the home, the voltage is reduced in stages, and correspondingly the current gets increased. This occurs in appiances called transformers.
I came across a lovely interactive explanation of this when in honeymoon in Hong Kong.
I couldn’t resist.
Tom Healy teaches Physics in Cabinteely Community School and for quite a while now has been uploading revision videos on Leaving Cert Physics to youtube. He has almost 50 up there by now and has divided them into Mandatory and Non-mandatory experiments.
A wonderful way to revise, but also a wonderful resource for any new teachers.
Why couldn’t this have been available when I was starting out?