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resistance in a wire
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- Words:
- 1048
- Submitted:
- Mon Oct 26 2009
- Mark submitted by Author:
... Resistance in a wire Prasal. S. Rohra IX-B Introduction: Resistance is the force which opposes the flow of an electric current around a circuit. Resistance is measured in ohms (). Resistance involves collisions between the free electrons, the fixed particles of the metal and its impurities. This collision creates friction due to which some of the energy the free electrons are carrying is converted into heat. Resistance can be measured using the Ohm's Law (named after Georg ohm): - Resistance of a wire can be affected by various variables like thickness, purity, temperature, material and length out of which length is an important one. There is a direct relationship between the length of a wire and its resistance because as the length of a wire is doubled so is the resistance. As resistance is a result of collisions between the free electrons and the fixed molecules of the metal of a
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