Resistance of a Wire :: Papers

opponent of a Wire Aim - I hope to find come to the fore how resistivity of a wire is affected. Prediction - I predict that as the length of the wire attachs the resistance leave alone also increase. Scientific association - ======================= A wire is a bundle of metal strips coated in plastic. The plastic can vary in colour and connect to diametric last(a)s These are - ------------ Black = negative final Red = positive terminal Blue = neutral terminal Green and yellow = earth terminal Brown = live terminal The poppycock varies because it has free electrons, which are able-bodied to flow through the wire. The number of the electrons depends on the amount of electrons in the outer(prenominal) energy shell of the atoms, so if there are more or larger atoms thence there must be more electrons available. If the material has a high number of atoms there will be a high number of electrons causing a lower resistance beca use of the increase in the number of electrons. Also if the atoms in the material are virtually packed then the electrons will confine more frequent collisions and the resistance will increase. Resistance is measured in Ohms (). Ohms Law The law truly says that the resistance of a metal conductor is the same whatever the underway - unless its getting hotter. However most people think of these equations when the law gets mentioned V = IR V is Voltage in Volts, I is Current in Amps and R is resistance in Ohms. If the length of the wire is increased then the resistance will also increase as the electrons will have a longer distance to extend and so more collisions will occur. Due to this the length increase should be proportional to the resistance increase. If the wires comprehensiveness is increased the resistance will decrease. This is because of the increase in the space for the electrons to travel through.