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Lecture 21

PHYSICS 182 Lecture 21: PHYS182 Lecture 21
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Department
Physics
Course
PHYSICS 182
Professor
Shubha Tewari
Semester
Spring

Description
PHYS182 – Lecture 21 – Ohm’s Law and Resistance Ohm’s Law, Resistance, Resistivity • The resistance is purely a material property • It depends on the geometry of the conductor Resistance and Ohm’s Law • Moving charges collide with ions, defects inside material (lattice vibrations) • Flow rate depends on electric potential difference • Resistance – proportionality constant between current and voltage • The potential difference causes current to flow (“downhill,” by convention) • Resistance regulates the amount of flow Physical Resistance • A resistor is a circuit element designed to have resistance • Resistance depends on material parameters and geometry Resistance Quest
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