The factors affectingthe resistance of a wire Essay Example for Free

The factors affectingthe metro of a wire EssayAn investigation into the factors affecting the impedance of a wire Outline Start with a simple paragraph saying what you argon vent to do. Factors affecting resistance of a wire Material, Temperature, Length and Cross-sectional atomic number 18a Material is the same (constantan) and we are trying to keep the temperature constant. (you contend to say this) Length and cross sectional areas will be varied. This necessitate to be done in two separate experiments (Fair Test) Length and cross-sectional area are the item-by-item (input) variables. The dependent variable (output) is the resistance Science (essential). Use a textbook/internet/secondary spring to find this information. Say where you found it, it must be relevant to GCSE Detailed knowledge will stand the higher marks. Ohms Law which gives the relationship between the resistance, voltage and current. Give units and equations (show condemnly) How resistance is related t o length (draw a picture, it can also be used as your prediction). Back it up with an explanation (longer path for electrons)How resistance is related to cross-section (draw a picture, it can also be used as your prediction). Note, in that location are two plots here Back up with explanation (more pathways). Prediction Say what you are doing and use your cognition to back it up Safety The experiment should be safe and you will follow safe research laboratory practice Equipment At a glance you might well occupy crocodile clips, power supply, voltmeter, ammeter, variable resistor, leads, constantan wire, meter rule, micrometer (to measure wire thickness).Include a circuit diagram. Remember you might need to change equipment after the former experiment. Say what any equipment is used for. Preliminary Experiment The purpose is to check over if your method is suitable to test your prediction, make sure things work and make any changes. You will need to record these results and plot things. Use this information carefully and mention if you make no changes or changes. If the preliminary entropy looks sensible, then you are on the right track. Repeating MeasurementsThe same idea as for Chemistry, there needs to be enough different lengths (5 min) and cross-sections (5 min). Measurements need repeating and checking. If a particular set of info is not looking good, discard it and take another measurement. You ideally want 3 sets of similar data Precision Voltages, currents, resistances, lengths and wire thickness need to be recorded and presented to the correct level of precision. Say what ranges data will be collected over etc. Data Tables and PlotsMust have clear and correct units, titles, etc. These can be presented using spreadsheets. Plots must be done on graph write up (not computer). Must cover more than half of sheet and have suitable axes. Graphs must be aright labelled and the points should be crosses drawn in pencil. Best fit-lines should also be sh own. Seek help on this if not sure.References Most likely you found out things, say where you found this information. Fair Test short crucial to show. In a fair test you only allow one thing to vary.