Ohm’s law Essay

Predictions 1. The longer the tele interpret, the more it will resist the flow of electrons 2. The wider the fit the slight resistance it shall(a) have. 3. Copper will be the fit out which has the less resistance. 4. The antithetical types of wire will have different levels of resistance. Accuracy I am intending to besides get a reading for the length zero also using the crocodile clips and keeping the rope identical. This shall be my control. I funny that there will be resistance both in the circuit wires and in the multimeters. This will mean that the determine obtained for resistance of the wire shall be slightly excessively high.By subtracting the resistance value of the circuit wire from the resistance calculations I will get a more immaculate set of results. Also as I intend to draw a best fit line for my results, if all the points are slightly too high the gradient will be dramatically altered. The way in which the readings are being taken is designed so that the r eadings are hit-or-miss but in an orderly way so that I nookie spot any mistakes. Method Method apply The method used was identical to that explained under the planning section, above. The results (i. e. readings on the multimeters), were taken spate and site into tables. The results were as followsResults For nickel chromium wire, SWG 30 distance (cm) Width (mm) actual Readings (Amps) electric potential Readings (Volts) T3Length (cm) Width (mm) Current Readings (Amps) Voltage Readings (Volts) For nickel chromium wire, SWG 22 Length (cm) Width (mm) Current Readings (Amps) Voltage Readings (Volts) For copper wire, swg 30 Length (cm) Width (mm) Current Readings (Amps) Voltage Readings (Volts) judge 1 Try 2 Try 3 Ave. Try 1 Try 2 Try 3 Ave. For constantan wire, swg 30 Length (cm) Width (mm).Current Readings (Amps) Voltage Readings (Volts) For manganane wire, swg 30 Length (cm) Width (mm) Current Readings (Amps) Voltage Readings (Volts) bulwark values For nickel none Chromium Wire, SWG 30 Length (cm) Current (A) Voltage (V) subway (? )For Nickel Chromium Wire, SWG 28 Length (cm) Current (A) Voltage (V) Resistance (? ) For Nickel Chromium Wire, SWG 24 Length (cm) Current (A) Voltage (V)Resistance (? )Patterns and trends It end be quite clearly seen in most of my results that when a graph of length and resistance are plotted the result is a dependable line. In my case I have obtained a scatter graph with a very strong positive correlation. In graph 1 It move be seen that there are four dandy lines leaving through the origin. These straight lines are the values for Nickel Chromium at different gauges. The gauge values are as followsGauge diam (mm) graph two, it deal seen that this is not a relationship of direct equipoise as the correlation doesnt point towards the origin. Also from graph one, it can be seen that the resistance increases as the length does. All these lines are straight and they all pass through the origin, so I think it is take over to conclude that Resistance is directly proportional to the length of the wire. Finally it can be seen from graph three that the resistance in different types of wire varies according to the type.Keeping the gauge constant this was tested and the results were as follows Nickel Chromium is the most repelling, Manganane is the second most resistance, Constantan is third, And the least resistant is copper. All the evidence her proves that my results agree with my hypothesis. (c. f. section P). Evaluation Reliability The reliableness of these results is quite good. This is because the procedure is relatively straight forward, and the numbers are not difficult to record. I think the results are certainly reliable large to support both of my conclusions firmly. Anomalus results.There are a few anomalus results passim the experiment. The resistance values in the table are not perpetually increasing, and this is not always occurring at a steady rate. Good eccentric of which are th e readings for 40 and 50 cm on the copper wire. I think that this is just a mistake in winning down the results or possibly we didnt wait foe the voltmeter to stabilize. Experimental errors These could imply many things, the most likely of which are a short circuit, The wire may have heated up causing less resistance, and the readings on the multimeters could have been inaccurate.Further work This could include finding a more varied set of results, testing more types of wires. It could also include taking more readings to get better averages. I would suggest using all the rest of the equipment in the same way. Also one could try to analyze temperature changes by using insulated wires and a tray of cold/warm or alive water. Show preview only The above preview is unformatted text This assimilator written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.