Does a light Bulb Obey Ohm’s law? Essay

Does a aerial Bulb Obey Ohms legal philosophy? Obtaining Table of Results Voltage 1 Current 1 Voltage 2 Current 2 number Voltage Average Current Average ResistanceAnalysis After conducting my audition and analysing my results I cook found that a high spirits light medulla oblongata does not come after ohms law, it is a non-ohmic conductor.From the graph obtained from the results it is clearly shown how ohms law doesnt apply to the vindicated bulb. The graph clearly shows that the original is not proportionate to the voltage. The graph shows that as the voltage increased the increase in menses was reduced. i. e. when the potential difference was 4 volts the current increased by 0. 34 amps, when the potential difference was 8 volts the current increased by 0. 22 amps. The results shag be explained employ science. Variables The unsettled quantity stars in the experiment Independent shifting I altered this variable.Voltage Controlled Variables Length of wire Cross sect ional argona of wire Wire Material Light Bulb median(a) Test Controlled Variables For the interest of a fair test and accurate results, these controlled variable entrust be maintained and unplowed constant for each voltage, as they can affect the rate of reaction Length of wire. The longer the wire, the upgrade the electrons have to pass, so the more the resistance. The shorter the wire the less the electrons have to travel so the less the resistance Cross sectional area of wire.The larger the flub section of a wire, the less struggle for electrons to go past, the trim the resistance. The littler the cross section of a wire, the more struggle for electrons to go past, the great the resistance Wire Material. Different materials conduct electricity in several(predicate) ways, the better the conductor, the less the resistance. The worse the conductor, the more resistance. The similar light bulb, which had the same tungsten filament. Ohms law does not apply to circuits where at that place are temperature changes. The variable, temperature, meant that ohms law could not be applied to the light bulb.It is the light bulb itself that emits the heat. Its source is the tungsten filament, as when electrons raise to pass through the tungsten filament they collide with the tungsten atoms which gravel heat and increase the atoms vibration, which leads to further collisions and leads to more light heat and of channel resistance. The result supports my Hypothesis. Evaluation I believe the investigation was successful as the results produced agree with scientific knowledge. In the Ohms Law coursework I investigated whether or not a light bulb obeyed ohms law.In the experiment we progressively increased the potential difference to see how it affected the current flowing through a light bulb. The experiment was carried out accurately in many another(prenominal) ways. All variables, different that voltage, the independent variable and temperature, were kept at a constant. The results were handled with accuracy. The results were plotted on a graph. A telephone circuit of best fit was put on each result which meant the results are very accurate, rather than being rounded. The method in which the Ohms Law investigation was carried out is sufficient enough to support a faithful conclusion, this is becauseAll variable, which effect resistance, were controlled and maintained. With the exception of, voltage, the independent variable and temperature, all were kept constant. For the interest of a fair test and accurate results, these controlled variable will be maintained and kept constant for each voltage, as they can affect the rate of reaction Length of wire. The longer the wire, the further the electrons have to travel, so the more the resistance. The shorter the wire the less the electrons have to travel so the less the resistance Cross sectional area of wire.The larger the cross section of a wire, the less struggle for electrons to go past, the lower the resistance. The smaller the cross section of a wire, the more struggle for electrons to go past, the greater the resistance Wire Material. Different materials conduct electricity in different ways, the better the conductor, the less the resistance. The worse the conductor, the more resistance. The same light bulb, which had the same tungsten filament. Voltage was supplied with an accurate variable d. c. supply. Current was measured using an accurate ammeter and voltage was measured with an accurate voltmeter.For further accuracy I conducted the experiment twice so I could work out the average. both(prenominal) times the results were expected and were very similar. Therefore I believe that this investigation has sufficient evidence to support a conclusion that a bulb does not obey ohms law. A bulb is a non ohmic conductor. If I were to repeat the investigation I would improve it by Using other conductors like lasers. Made the length of the wire into a an independent va riable Made the cross section area of the wire into an independent variable Made the material of the wire into an independent variable.Made the type of bulb into an independent variable Although I believe my investigation to be a success I believe if I were to make the improvements I said, I would have reliable results with an even stronger conclusion as a wider wander of information would have been taken into account Ohms Law 1 Stepney Green School 10548 Show laggard 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 Magnetism section. transfer this essay Print Save Not the one?