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Factors On Which The Resistance Of A Conductor Depends

Follow us:   / 7activestudio   For more information: www.7activestudio.com [email protected] Contact: +91- 9700061777, 040-66564777 7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for K-12. We also customise the content as per your requirement for companies platform providers colleges etc . 7 Active driving force "The Joy of Happy Learning" -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D & 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use. Factors on which the resistance of a conductor depends:Activity: Take a cell, an ammeter, a nichrome wire of length L and 2L and copper wire length of L. Procedure: Connect cell, ammeter, plug key with connecting wire in series and leave the gap between the free ends of wires.Complete the circuit with nichrome wire of length L between x and y.Now plug the key note the ammeter reading. Say i1 = 2A.Now complete the circuit with nichrome wire of length 2L. note the ammeter reading i2 = 1A. we can say that i1 is greater than i2.We can say that resistance of the conductor is depends on the length.Now complete the circuit with thicker nichrome wire of length l, observe the ammeter reading. Say i3 = 4A. We can say that resistance depends on area of cross section.Now complete the circuit with copper wire of a length l, and same thickness equal to nichrome wire. And observe the ammeter reading, say i4 = 3A.We can say that i4 is greater than i1. We can say that resistance is depends on nature of its material.Thus, resistance of a uniform metallic conductor is directly proportional to its length l and inversely proportional to area of cross section A.From 1 and 2R proportional to L by ATherefore, R equal to rho into L by A Here rho is a proportionality constant called electric resistivity of the material of the conductor.The SI unit of resistivity is ohm-meter.The metals and alloys have low resistivity in the range of 10-8 ohm-meter to 10-6 ohm-meter.For insulators, like rubber and glass have resistivity of the order of 1012 ohm-meter to 1017 ohm-meter. The alloys don't oxidize or burn readily at high temperatures.For this we can use in heating device like electric iron, toaster, bulb etc., Where, as copper and aluminum are used for power transmission lines.