How the length of wire affects its resistance.

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How the length of wire affects its resistance

By, Harinder Khaira

Introduction-

In our investigation we are trying to find out that what are the factors which effect the resistance of a resistance wire. Through textbooks and information from the Internet I have identified these factors.

-The length of the wire

-The thickness of the wire

-The material of the wire

-The temperature of the wire

Through my general knowledge and reading through various textbooks I know that electrons move more easily through some conductors than others. And that the resistance is the opposing force, which slows down the flow of electrons. And through learning I know that good conductors have low resistance and poor conductors have high resistance. And a resistance is caused in a circuit when a free moving electron collides with an ion where the kinetic energy of the electron is transformed to heat energy and therefore it loses its speed and in turn the material the electrons were flowing through gets hot. From past learning I know that the free moving electron is said to be “free” because they have enough energy to escape from the attraction of the nucleus, and move with a random motion. And they will flow in one direction from the negative side to the positive of the circuit (because the electron is negatively charged) when I pass a current through the circuit. While reading through a textbook I also found out that when the current is passing through the circuit the electrons would have many opportunities to collide with an ion because this is a fixed structure of the metal wire that I will be testing. And would be attracted to the negative side of the circuit because it is positively charged but however it cannot move because it has no energy to do so or again because it is a fixed structure.

           Trough learning I know that the best way to find out the resistance of a wire in ohms is by using the following equation.

              Resistance of                  voltage across the conductor

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              A conductor           =      current through the conductor

           

  Which in short can be written as                      

                                                                      V

                                ...

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