OpenStax University Physics/E&M/Current and Resistance

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(Vol. 2):    5:Electric Charges and Fields    6:Gauss's Law    7:Electric Potential    8:Capacitance    9:Current and Resistance    10:Direct-Current Circuits    11:Magnetic Forces and Fields    12:Sources of Magnetic Fields    13:Electromagnetic Induction    14:Inductance    15:Alternating-Current Circuits    16:Electromagnetic Waves


Chapter 9[edit | edit source]

Current and Resistance[edit | edit source]

Current (1A=1C/s) where (density, charge, drift velocity) of the carriers.

▭  , is the perpendicular area, and is current density. is electric field, where is resistivity.
▭ Resistivity varies with temperature as . Similarily, where is resistance (Ω)
▭ Ohm's law ▭  Power

For quiz at QB/d_cp2.9[edit | edit source]

Electric current: 1 Amp (A) = 1 Coulomb (C) per second (s)

Current=, where

= (density, charge, speed, Area)

where =current density.

= electric field where = resistivity

, and ,

where is resistance

and Power=