Engineering Science 1021A/B Lecture Notes - Lecture 35: Current Density, Electric Charge
17 May 2018
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Typical form of Ohm's Law:
𝑣 = 𝐼𝑅
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Resistance is not a material property
It is a function of geometry
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Material property is resistivity
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There are similar, geometry independent expressions for current and voltage
Current density is also equal to the number of charge carriers
multiplied by the charge on each carrier multiplied by the average
velocity of each carrier,
The charge on one electron, e = 1.602×10-19C
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Ohm's Law (independent of geometry):
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Electrical charge is measured in units of coulombs
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Ohm's Law
