Resistance Of Wire :: Papers

Resistance Of Wire Aim. To find out what happens to the resistance of a fit out, when you change the length of the wire. scene Information. A current of electricity is the flow of negatively charged electrons around a circuit. IMAGE IMAGEIMAGE IMAGE IMAGE IMAGE IMAGE Close up, the wire and the electrons look like this IMAGE The electrons collide with the atoms as they fail through. We say the atoms oppose the flow of electrons. This is called resistance, and the wire gets hotter. In 1826, Georg Ohm discovered that when a current flows through a metal wire the current and the potential differences are proportional, providing that the temperature form constant. The resistance of wire can be calculated using IMAGE Variables. Temperatureincreases the resistance as the atoms are getting hotter they are vibrating and moving faster. This makes the atoms and the electrons collide to a greater extent. Thickness of wire decreases the res istance, as there is more room for the electrons to travel past the atoms. They dont collide as much. Length of wire increases the resistance because the electrons have further to move and more collisions occur. So, if you double the length of wire, you double the resistance. Because the number of atoms and the number of collisions doubles. Type of wireaffects resistance because different types have different atom arrangements. Some have different patterns, and any(prenominal) are arranged so that electrons have an easier path to travel through the atoms. Fair Test. To make the experiment fair, I allow make sure that the temperature rest the same flowing through the power pack and wire. I will do this by turning it off and recording my results quickly. In addition, I will make sure that the thickness and the type of wire are the same. I will only change the length of the wire. Prediction. I predict that the resistance will increase because the leng th of wire