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PHYS 1P22/92

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Home > Courses > 1P92_Bauer > ElectricCircuits

Electric circuits, Current and Resistance

Current is a movement of charge
Voltage and Electric Field

Resistance

defined phenomenologically: \(R = V/I\), Ohm's Law
defined phenomenologically: \(J = \sigma E\), Ohm's Law
Ex: electric socks
defined through material's properties: \(R = \rho L/A\)
Ex: reshaping a wire
Ex: current and wire diameter

a water analogy
Simple electric circuits

in series; Kirchhoff's voltage rule (KVR)
in parallel; Kirchhoff's current rule (KCR)
equivalent resistance

Energy/power in electric circuits

defined: \(P = VI=I^2R = V^2/R\),