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- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/PHY_2030%3A_General_Physics_II/19%3A_Electric_Current_and_Resistance/19.3%3A_Resistance_and_ResistorsOhm’s Law states that current is proportional to voltage; circuits are ohmic if they obey the relation V=IR.
- https://phys.libretexts.org/Courses/Joliet_Junior_College/PHYS202_-_JJC_-_Testing/01%3A_Conceptual_Objective_1/1.01%3A_OverviewAtoms contain negatively charged electrons and positively charged protons; the number of each determines the atom’s net charge.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/17%3A_Electric_Charge_and_Field/17.1%3A_OverviewAtoms contain negatively charged electrons and positively charged protons; the number of each determines the atom’s net charge.
- https://phys.libretexts.org/Learning_Objects/Visualizations_and_Simulations/PhET_Simulations/PhET%3A_Resistance_in_a_WireObserve changes to the equation and wire as you play with the resistivity, length, and area sliders.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/19%3A_Electric_Current_and_Resistance/19.3%3A_Resistance_and_ResistorsOhm’s Law states that current is proportional to voltage; circuits are ohmic if they obey the relation V=IR.
- https://phys.libretexts.org/Courses/Joliet_Junior_College/JJC_-_PHYS_110/07%3A_PhET_Simulations/7.24%3A_PhET-_Resistance_in_a_WireObserve changes to the equation and wire as you play with the resistivity, length, and area sliders.
- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/05%3A_Electric_Current_Resistance_and_Ohm's_Law/5.05%3A_Resistance_and_ResistivityFor a cylinder we know \(R = \rho L / A\), and so, if \(L\) and \(A\) do not change greatly with temperature, \(R\) will have the same temperature dependence as \(\rho\). (Examination of the coefficie...For a cylinder we know \(R = \rho L / A\), and so, if \(L\) and \(A\) do not change greatly with temperature, \(R\) will have the same temperature dependence as \(\rho\). (Examination of the coefficients of linear expansion shows them to be about two orders of magnitude less than typical temperature coefficients of resistivity, and so the effect of temperature on \(L\) and \(A\) is about two orders of magnitude less than on \(\rho\).) Thus, \[R = R_{0} \left( 1 + \alpha \Delta T \right) \label{…
- https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/20%3A_Electric_Current_Resistance_and_Ohm's_Law/20.03%3A_Resistance_and_ResistivityThe resistance of an object depends on its shape and the material of which it is composed. For a given shape, the resistance depends on the material of which the object is composed. Different material...The resistance of an object depends on its shape and the material of which it is composed. For a given shape, the resistance depends on the material of which the object is composed. Different materials offer different resistance to the flow of charge. We define the resistivity ρ of a substance so that the resistance R of an object is directly proportional to ρ.
- https://phys.libretexts.org/Courses/Skyline/Survey_of_Physics/08%3A_Electric_Current_and_Resistance/8.04%3A_Resistance_and_ResistivityThe resistance of an object depends on its shape and the material of which it is composed. For a given shape, the resistance depends on the material of which the object is composed. Different material...The resistance of an object depends on its shape and the material of which it is composed. For a given shape, the resistance depends on the material of which the object is composed. Different materials offer different resistance to the flow of charge. We define the resistivity ρ of a substance so that the resistance R of an object is directly proportional to ρ.
