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Feb4Note - PHYS142 Lecture 13 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 13
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Definition of electric current : The electric current is the rate of flow of charge across a surface. Units for current: C/s ampère [A] The direction of the electric current is defined as the direction of motion of a positive charge. Δt ΔQ I or dt dQ I The direction of the electric current is opposite the direction of electron flows . 2
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