Lab Report: Testing How the Length of a Wire Determines its Resistance :: essays research papers

Science CourseworkThe Resistance of a WireAimTo find surface how the length of a wire affects the resistance of it.KnowledgeOhms Law is a mathematical equation that shows the relationship between Voltage, Current and Resistance in an electrical circuit. It is stated as&61623, V = I x R &61623, R = V / I &61623, I = V / RWhere V = Voltage I = Current (I stands for INTENSITY) R = Resistance In suppose to understand what Ohms Law is all about you need to understand electricity and what makes Voltage, Current and Resistance in a circuit.CurrentCurrent is the impulsion of negatrons in a circuit but What are electrons and what makes them move? tout ensemble matter is made up of Atoms. Piece of metal made up of AtomsEach piece is made up of a nucleus that has a certain number of protons and neutrons with an equal numbers of electrons in orbit.The copper section has 29 protons in its nucleus with 29 electrons orbiting the nucleus. The electrons are arranged in orbits called sh ells. Notice that in the copper atom, the right(prenominal) shell has only atomic number 53 electron. The outer shell of any atom is called the valence shell. When the valence electron in any atom gains sufficient energy from some outside force, it finish break away from the parent atom and become what is called a free electron.It is very easy to provide enough energy to political campaign the valence electron to become free. Some sources of energy are heat, light, magnetised fields and a voltage source. When the valence electron becomes free it leaves shtup an atom that has a validating charge. Remember that the copper atom has 29 + protons and 29 electrons so if unrivalled electron leaves orbit we are remaining with +29 protons and 28 electrons. That means the atom has a more positive charge because of the one less electron. This is an unbalanced atom and is not natural. The atom will always try to get an electron back into the valence orbit to become normal or balanced again. This is the one concomitant that you should remember and try to visualize when working with electrical circuits. Electric underway is the movement of electrons from one atom to another in a conductor. If you can visualize a piece of copper wire with billions of atoms and each one of them losing an electron and all the electrons jumping to other atoms, you will begin to let on what current is.