Resistivity, resistance, and ways to increase an object's resistance are explored within the context of different materials and shapes.
Resistivity (p) is an intrinsic property of a material, whereas resistance (R) depends on the material as well as the shape and size of an object. Having only one value for resistivity does not mean an object can have only one resistance because resistance also depends on the object's dimensions.
To increase an object's resistance without changing the material, you can increase the length of the object or decrease the cross-sectional area. These changes impact the resistance of the object without altering the material's resistivity.
Superconductors provide an interesting exception as they can maintain a current with no applied voltage, showcasing zero resistance at low temperatures.
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