Resistance of a Wire †Triple Science Essay

I also will be measuring the telegraph using a meter ruler and will be keeping the temperature down by keeping the power gestate level at 2volts. Apparatus 1. 1 Metre Ruler 2. 1 Power Pack 3. Sellotape 4. shifting Resistor 5. Ammeter 6. Voltmeter 7. Constantan fit out Method I connected my circuit together as shown in the diagram to a higher place. I attached the fit out to the meter ruler using pins. As I carried on doing the examine I adjusted some of the wires to repair out sure everything was correct and in place. Steps 1. Adjust angiotensin-converting enzyme bill length of constantan wire onto the metre ruler, and added the pins.2. Adjust and connect any the wires together 3. Turning on the power pack. The voltage and current are then read gain the ammeter and voltmeter 4. The power supply then turned off, and the crocodile garnish moved to the abutting position I counted the seconds of how long the power pack was on for to attempt for the investigation, my part ner then read the results, and wrote it down, while I moved the clip to the next position. I double checked my results, making sure I was close to the true value, so I had no outliers. Results.When doing my experiment on the different lengths of the wire, I double checked everything, to fix that everything was correct, and on that point was no in-corrections. I recorded my results in the table below Length (cm) potentiality (V) watercourse (I) Resistance (a) Voltage (V) Current (I) Resistance (a) Voltage (V) Current (I) Resistance (a) 1I saw that I had no outliers. I then figure the means of the voltage, current and then from that calculated the metro (V/I). R1 R2 R3 Mean start From the tests and my graph, I acknowledged that the longer the wire, the larger the resistivity.My graph gives a controlling correlation. When I doubled the length of the wire, the resistance also doubled, for example, when the wire was 10cm, the resistance was 0. 15 (a), When the wire is 20cm, the resistance was 0. 31cm.Therefore, the fact that the resistance increases with the length, I take a shit gathered that the longer the piece of the wire, the further the electrons have to travel, which means there are more ions for the electrons to bump into, so when the length of the wire doubles, the more ions there are for the electrons to bump into, which makes the resistance increase. As the length increases, the resistance of the current increases because the current has further to go through in the wire, thusly it has to go past more stationary atoms, which cause more collisions, and therefrom there is more resistance.However, I believe that my results are reasonably reliable, because i repeated my experiment twice, and i double checked my calculations for the mean. My line on the graph, were mainly on the best line of fit. Fair Test To ensure that my tests and results were fair, I had to keep variable the same. The variables that I had to keep the same where the temperatur e of the wire, collectable to the face that the wire gained more thermal energy as the ions began to agitate (This would sometimes become a problem when the wire was 10cm, because the wire was non as long.)However it seemed to be fine, which was expected because I chose constantan, which is turn up to have a very low temperature increase. Another factor that I had to keep the same is the poppycock of the wire because depending on the material, each material conducts different amounts of heat, which would meet the resistance. Reliability To make sure that my readings were all reliable, I had to double check and repeat my experiment again, so that I could grapple any errors in my results. Using the wide range of lengths from 10cm to 1 metre allowed me to get a good range of results so that I could make a good conclusion.Accuracy To make sure that my test was dead on target, I had to control the various procedures of the tests. mavin way in which I did this, was to footstep t he length of the constantan. The reason why I did this is to make sure that all my tests were accurate, and that my results would be close to the true value, or at least reliable. precaution To make sure that all the tests are done safely, the power pack settings will be under 5 volts, so that the constantan wire will not get too hot and burn. If I did not take this safety measure into consideration then it could damage and affect the experiment, and give un-reliable results.Also all bags and outdoor clothing will be away from the experiment, in case any heat causes any accidents. valuation At the start of the investigation, I dont believe that I started off to well, as I was behind the rest of my peers, because my partner and I was a bit confused. However, when I understood what I was doing, I currently caught up, and was off to a flying start. The length investigations went very smoothly. I did arrest that sometimes, it was quite difficult to be accurate with whether the tip o f the crocodile clip was just now on the measurement I wanted, because it would make around etc.One way I could have made sure that I was doing this accurately, was to make sure I pinpointed, If I had ensured this, I would have got more accurate readings, and much more precise measurements. Copper Atoms Electrons 3rd Test second Test 1st Test Show preview only 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 magnetic force section.