Section 3
Resistance and Resistors
Book
Version 3
By Boundless
By Boundless
Boundless Physics
Physics
by Boundless
4 concepts
![Thumbnail](../../../../../../figures.boundless-cdn.com/11738/raw/fourivcurves.jpg)
Ohm's Law
Ohm's Law states that current is proportional to voltage; circuits are ohmic if they obey the relation V=IR.
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Temperature and Superconductivity
Superconductivity is a phenomenon of zero electrical resistance and expulsion of magnetic fields in certain materials below a critical temp.
![Thumbnail](../../../../../../figures.boundless-cdn.com/11742/square/figure-21-03-01a.jpeg)
Resistance and Resistivity
Resistance and resistivity describe the extent to which an object or material impedes the flow of electric current.
![Thumbnail](../../../../../../figures.boundless-cdn.com/11750/square/figure-21-03-03a.jpeg)
Dependence of Resistance on Temperature
Resistivity and resistance depend on temperature with the dependence being linear for small temperature changes and nonlinear for large.