Resistance of wire :: essays research papers

IF YOU add THE VOLTAGE - MORE CURRENT WILL FLOW. 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 leave behind only bunk 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. metro 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 telegram). It is measured in OHMS (&8486). Resistance occurs when the electrons travelling along the equip shake up with the atoms of the outfit. These collisions soft down the flow of electrons causing resistance. Resistance is a measure of how sturdy it is to move the electro ns through the wire. The resistance of a wire depends on the bout 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 increased the number of atoms will likewise 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 means 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 tuition. All 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 longer th e lengths of wire the higher 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 analogous are The same material used for the wire, The same cross-sectional area of wire, And the same temperature of the wire. The potency difference from the power pack 2V.