I found the definition of the jellium model that is "A model of electron-electron interactions in a metal in which the positive charge associated with the ion cores immersed in the sea of conduction electrons is replaced by a uniform positive background charge terminating along a plane that represents the surface of the metal"
http://www.answers.com/topic/jellium-model.
I THINK BOTH DRUDE AND SOMMERFELD MODELS HAVE THE SAME APPROACH OF THE CHARGE OF THE CONDUCTION ELECTRONS
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