Monthly Archives: February 2013

Waves for AS and A2

We’re going to suppose that you understand the basic IGCSE concepts of amplitude, frequency, period, speed and wavelength. Don’t worry if we happen to spill over a little bit outside the syllabus, this is what this blog is for and the idea … Continue reading

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Joule Heating and Electrical Power

Joule heating is the term used to describe the fact than when an electrical current passes through a conductor, the material gets hot. Put simply, the drift velocity of the moving charges creates what could be described as electrical friction … Continue reading

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Drift Velocity

What determines the resistivity of a metal? Clearly the mobility of the free electrons which can be caused to drift down the wire by the voltage pushing them. In metals there might be just over 2 free electrons per atom … Continue reading

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Resistivity

A few thoughts about stitching some simple ideas together. We know that resistance is a property of a device, like a particular light bulb, motor or resistor under certain conditions, thus Ohm’s Law is a law which doesn’t hold under … Continue reading

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