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This report is aimed at answering the following question: ``why do real metals oppose the flow of current?'' The simple answer is ``because electrons can't be accelerated indefinitely by an external field without loosing energy''. This report will focus on answering this question in more detail, in the framework on Fermi Liquids. Liquids -- though most of the argument only depends on weakly interacting charge carriers, irrespective of them being Landau quasiparticles.