Resistivity Coursework Essay Example for Free

Resistivity Coursework EssayTheory suggests that the resistance of a wire is prime with this formula R=? L/A R = Resistance ? = Resistivity of wire L = duration of wire A = cross-sectional area I will now perform an investigation to bear out the legitimacy of this formula and confirm a value for ? in a Nichrome wire. Planning A4c Fully denominate Diagram A4d, A6d Comprehensive list of Apparatus including Instrument Ranges Variable power provide unit one-dimensional 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 telegram (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 supererogatory heating in wires including the Nichrome not only a hazard but whitethorn compromise my interpretations. snitch sure my practical investigation is free of all or any obstructions an y 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 relative to apiece other. Constants are current (I), cross sectional area of wire (A) Resistivity (? ) and temperature of the Nichrome wire. An R against L graph must 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 negative crocodile clip on 0. 100m increase current to 0. 30A take reading from voltmeter as quickly as possible for the wire to remain at the same switch discharge power when entering the reading into required data connect the voltmeter negative crocodile clip to increased 0. 200m usurp process till I reach 1. 000m re peat the whole process again but with 0. 60A speckle a graph of R vs. L which is required to be a straight line with the origin use the graph of R vs. L to find the value of R use demonstration complete essay.The above preview is unformatted text This student written piece of work is one of some that can be found in our GCSE Electricity and Magnetism section. Download this essay Print bring through Heres what a teacher thought of this essay 4 star(s)