Resistivity Coursework Essay Example for Free

Resistivity Coursework EssayTheory suggests that the resistance of a wire is found with this formula R=? L/A R = Resistance ? = Resistivity of wire L = length of wire A = cross-sectional area I will this instant perform an investigation to confirm the legitimacy of this formula and confirm a range for ? in a Nichrome wire. Planning A4c Fully labelled Diagram A4d, A6d countywide list of Apparatus including Instrument Ranges Variable power supply unit Analogue ammeter, accuracy 0. 01A, range 0 to 1. 0A Analogue Voltmeter, accuracy 0. 1V, range 0 to 5V Copper leads x5 Crocodile clip x2 Nichrome Wire (diameter=4. 57 x 10-4m).Ruler, accuracy 0. 001m, range 0 to 1. 000m A2c Safety Confirm the Initial power supply is at 0 volts other wise huge voltages will most likely cause unnecessary heating in wires including the Nichrome not only a hazard still may compromise my readings. Make sure my practical investigation is free of all or any obstructions any unnecessary wires may cause a short circuit leading to damaging the power supply unit, ammeters and voltmeters. A4b, A6a Identifying Variables and Constants The variables in this investigation are voltage (V), resistance (R) and length of Nichrome wire (L).Resistance and length are directly proportional to each other. Constants are current (I), cross sectional area of wire (A) Resistivity (? ) and temperature of the Nichrome wire. An R against L graphical record must(prenominal) look like this, (look below,) if resistance and length are directly proportional to each other.A4c Detailed Plan confirm power supply unit is at 0v construct apparatus as illustrated in diagram connect voltmeter prejudicial crocodile clip on 0. 100m increase current to 0. 30A take reading from voltmeter as apace as possible for the wire to remain at the same switch off power when entering the reading into required data connect the voltmeter negative crocodile clip to increased 0. 200m repeat process till I reach 1. 000m repeat the wh ole process again but with 0. 60A plot a graph of R vs. L which is required to be a straight line through the origin use the graph of R vs. L to find the value of R use Display complete essay.The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section. Download this essay Print Save Heres what a teacher thought of this essay 4 star(s)