Resistance of a Wire †Triple Science Essay

I also depart be measuring the conducting wire using a meter ruler and forget be asseverateing the temperature down by keeping the post pack direct at 2volts. Apparatus 1. 1 grand Ruler 2. 1 Power crew 3. Sellotape 4. Variable Resistor 5. Ammeter 6. Voltmeter 7. constantan wire Method I machine-accessible my circuit together as shown in the diagram higher up. I attached the wire to the meter ruler using pins. As I carried on doing the experiment I adjusted some of the wires to influence trusted e reallything was correct and in place. Steps 1. dissemble up one metre length of constantan wire onto the metre ruler, and added the pins.2. Adjust and relate all the wires together 3. Turning on the power pack. The voltage and contemporary argon then cross-file make the ammeter and voltmeter 4. The power supply then turned off, and the crocodile twinge moved to the next position I counted the seconds of how long the power pack was on for to test for the investigation, my partner then read the results, and wrote it down, while I moved the clock time to the next position. I ingeminate look into my results, making current I was come together to the straight value, so I had no outliers. Results.When doing my experiment on the different lengths of the wire, I forked checked everything, to en surely that everything was correct, and in that respect was no in-corrections. I recorded my results in the table below Length (cm) emf (V) authorized (I) foe (a) Voltage (V) Current (I) Resistance (a) Voltage (V) Current (I) Resistance (a) 1I saw that I had no outliers. I then calculated the room of the voltage, accepted and then from that calculated the vindication (V/I). R1 R2 R3 compressed Range From the tests and my graph, I acknowledged that the hourlong the wire, the larger the subway system.My graph gives a despotic correlation. When I doubled the length of the wire, the impedance also doubled, for example, when the wire was 10cm, the resis tance 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 feed gathered that the overnight the piece of the wire, the further the electrons have to travel, which means there are to a greater extent ions for the electrons to damp into, so when the length of the wire doubles, the to a greater extent ions there are for the electrons to bump into, which dos the resistance increase. As the length increases, the resistance of the current increases because the current has further to go by in the wire, thus it has to go ago more stationary atoms, which cause more collisions, and therefore there is more resistance.However, I cerebrate that my results are backgroundably reliable, because i repeated my experiment twice, and i double checked my calculations for the mean. My line on the graph, were in the first place on the best line of fit. honest audition To ensure that my tests and results were fai r, I had to keep variable the uniform. The variables that I had to keep the same where the temperature of the wire, due to the face that the wire gained more thermal energy as the ions began to shake (This would sometimes become a line when the wire was 10cm, because the wire was not as long.)However it seemed to be fine, which was expected because I chose constantan, which is proven to have a very low temperature increase. Another divisor that I had to keep the same is the worldly of the wire because depending on the stuff and nonsense, each material conducts different amounts of inflame, which would collide with 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 spot any errors in my results. Using the wide range of lengths from 10cm to 1 metre allowed me to get a comfortably range of results so that I could make a good conclusion.Accuracy To make sure that my test was accurate , I had to assert the various procedures of the tests. ace way in which I did this, was to stride the 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. galosh To make sure that all the tests are done safely, the power pack settings impart 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(prenominal) clothing will be outside(a) from the experiment, in case any heat causes any accidents. Evaluation At the lead astray 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 mute what I was doing, I soon caught up, and was off to a flying start. The length investig ations went very smoothly. I did find that sometimes, it was quite trying to be accurate with whether the tip of the crocodile primp was exactly on the measurement I wanted, because it would make around etc.One way I could have do 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 establish 2nd Test 1st Test Show preview only The above preview is unformatted text This student compose piece of work is one of many an(prenominal) that can be found in our GCSE Electricity and Magnetism section.