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Electric current is the net charge that flows through a surface per unit time Ohm’s law: The resistivity (or conductivity) of a material is independent of the magnitude and direction of the applied electric field. 1 Electric current is the net charge that flows through a surface per unit time i dq dt q idt Current density j = i/A i j dA j envd vd is the drift velocity j,E vd 2 Ohm’s law: The resistivity (or conductivity) of a material is independent of the magnitude and direction of the applied electric field. j E E j R V I R L A Capacitor 3 Parallel plate capacitor Spherical and cylindrical capacitor 4 Parallel combination of capacitors Series combination of capacitors 5 Capacitor with a dielectric 6