Resistance of wire :: essays research papers

IF YOU INCREASE THE VOLTAGE - MORE CURRENT WILL lessen. IF YOU INCREASE THE RESISTANCE - LESS CURRENT WILL FLOW (UNLESS YOU INCREASE THE VOLTAGE). In Metals The Current Is Carried By Electrons 1. Electric current get out only string up if there are charges, which can freely move. 2. Metals contain a sea of "Free Electrons" (which are negatively charged). And flow throughout the metal if they are given energy. 3. This is what allows electric current to flow so well in materials. Resistance Resistance is anything that causes an opposition to the flow of electricity in a circuit. It is used to control the amount of voltage and /or amperage in a circuit. Everything in a circuit causes a resistance (even fit out). It is measured in OHMS (&8486). Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire. These collisions slow down the flow of electrons causing resistance. Resistance is a measure of how hard it is to move the electrons through the wire. The resistance of a wire depends on the number of collisions the electrons have with the atoms there will a larger number of collisions which will increase the resistance of the wire. If a length of a wire contains a certain number of atoms, when that length is change magnitude the number of atoms will also increase. E.g. If there is a wire that is half the length of another wire it would also have half the number of atoms, this core that the electrons will collide with the atoms half the amount of times. Also if the length of the wire is trebled or quadrupled then the resistance would also treble or quadrupled. My prediction was derived from this information. each of this information I collected originated from the Website, "www.studentcentral.co.uk" from encyclopaedias such as "The Oxford Childrens Encyclopaedia" and computer encyclopaedias such as "Encarta". This scientific information relates to my experiment by stating that the long er the lengths of wire the high the resistance. Preliminary Results Length Of Wire (mm) Voltage (V) Current (A) Resistance (&8486) Therefore this information supports my prediction that the longer the length of wire the higher the resistance. Obtaining Evidence The variables I kept the same are The same material used for the wire, The same cross-sectional area of wire, And the same temperature of the wire. The potential difference from the origin pack 2V.