Archive for the ‘Electricity’ category

Physics is *powerful* stuff

July 31, 2013

Funny - Science - Physics - Cat Butter 2An’ Yur OUTTA here!

That’s Area of Study One, Unit Four, Down! Now it’s up to you to make sure it stays down for the count, and that you’ve knocked it out conclusively – time for some preparation, a bit of (mental) exercise before final round, the Assessment task.

Some mood music, Maestro, Please: Link

OK, back to the serious stuff. Each of you are working on a common resource to share for the summary of this area of study, but you must also be preparing your own summary sheet (one page, one side) to be used for this task, and then revised for the next and saved for the final examination. Those resources are to be ready for distribution via the Melba Physics page on Friday, so everyone has a chance to use them over the weekend.

The first assessment task is a straight forward test – we have a data analysis task to follow. You know the nature of the questions we discussed in class, but here is a link to the cover pages and formula sheet for the task. There are also links to files that we used in class here (1, 2). Make the most of them – they will help you prepare if you make sure that what you are doing is focused so that you ace this task.

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Motorin’ on!

July 10, 2013

To my year 12 physics class: Get to it!

More to come…

Ohm-o-Sapiens (evolved again!)

May 4, 2013

funny - science - physics - cruel circuit problem kirchoff lawThe human species is continuously evolving – from the early hominids such as Homo Robustus, through the Neanderthals, and eventually Homo Sapiens. Physics students (Genus: Ohm-o-Sapiens) are clearly a new advancement in the Human species, as shown by the ability to tolerate torment provided by Physics Teachers…

OK, enough jokes – what we are doing with this post is going beyond the prior posts on electric circuit theory, and into component analysis. We have already looked at Ohm’s Law, Kirchoff’s Laws, and Thevenin’s Law – these are all based on the simple concept of simple “ohmic components”. Such circuits are relatively simple to solve (except like ones to left, and this one) – you use the rules of parallel and serial circuit elements to simplify the problem, and solve using Ohm’s Law.

Some components are not that easy – they don’t follow the simple patterns of ohm’s law. These devices do not have a constant resistance for a variety of applied voltages – their characteristic Voltage – Current graphs show a curve, and this is something you must be able to describe, analyse and discuss.

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Join the Resistance!

April 26, 2013

It’s time to get into the hard stuff – It’s time to join the resistance! Don’t let the current events know watt you are thinking – charge it up and…

Ah damn – I can’t come up with a pun for voltage. I’m sure one of you can – If I groan or laugh I will swear off bad puns in class for a week. That should be enough of an incentive for all of you!

Well, this post is mainly a link to a prior post, and an updated list of videos. I will add a link to some class notes shortly, but here are the two main links you need:

1: Post on Circuit Analysis. 2: Updated list of youtube videos.

See you all in class!

Gettin’ Energetic!

August 25, 2012

We’ve done a lot of study into energy this semester. We are working through our STELR books (link to PDF), and have looked at the idea of Global Warming, Energy storage and types of energy, Efficiency of conversion of energy from one type to another and we’ve done quite a few experiments.

You should be getting the idea that this is all about energy by now – how energy is used, how energy is produced, how energy can be converted into different forms and how energy can be lost when it is changed from one type to another.

Some of you saw this really clearly when you worked with the first big experiment, looking at how we can produce energy. Perhaps when you saw the bright lights shining on the solar panel gave enough energy to light up a small bulb, or perhaps when you saw the big fan (on high) could turn the wind turbine to make enough electricity to run a small fan…

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It Fields Good!

April 11, 2012

Electricity is the defining feature of modern life; almost everything we do relies explicitly on control of electricity. Try to think of one thing that you do that does not rely on electricity, at least partially. Remember, that unless you are using candles, it is using electricity. Unless you walk there “in the altogether”, it uses electricity.

That’s all fine, but how many people actually understand electricity? Most people use it without a second thought – where it comes from, how it is made, and how it is controlled – yet freely express ideas that are, at the least, ill-informed, regarding electricity.

You will learn about electricity through this unit of study, from the beginnings, which is: Electric Charge.

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