Feb2Notecont - PHYS142 Lecture 12 Current and Resistance...

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Current and Resistance Chapter 27 All sections except 3 27.1 Electric Current 27.2 Resistance 27.3 A Model for Electrical Conduction 27.4 Resistance and Temperature 27.5 Superconductors 27.6 Electrical Power 1 PHYS142 Lecture 12
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Electric Current (27.1) Conductors / metals In metals, the valence electrons are very weakly attached to their parent atoms. • These electrons can be considered to be “ free ”. If an electric field is applied, the free electrons will move in the direction of the force applied on them. + Bound electrons Free electrons E F F 2 Charge carrier Electrons Ions Holes protons
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