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# Feb4 - PHYS142 Lecture 13 Current and Resistance Chapter 27...

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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 . 3
Electrical resistance (27.2) The larger the potential difference , the larger the current inside the conductor. V I E I V V = RI Ohm’s Law R : Resistance V : Voltage across the resistor I : Current passing through the resistor. Units for Resistance: V/A Ohm [ ] 4

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: For a given voltage, a larger R will produce a smaller current. i.e. “Resistance” to current flow.
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Feb4 - PHYS142 Lecture 13 Current and Resistance Chapter 27...

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