Profile photo of Andrew Normand

I have always taught the Drude classical eelctron gas model at AS level as a beautiful example of 19th century physics which also happens to lead elegantly both into Ohm’s law (why is V proportional to I?) and resistivity (as the geometric parts also appear naturally in the model). Of course it is limited – it cannot explain superconductors for a start and it is purely classical so gives no handle on semiconductors either – but I think it helps to ‘see’ what is happening in a conductor nicely.

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