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An Investigation of the Chemical Behaviour of a Light bulb Filament

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An Investigation of the Chemical Behaviour of a Light bulb Filament I will plan to see if there is a relationship between the current, the potential difference, the resistance and the temperature of a light bulb filament. Safety:- The Current- This is not a major problem as the current is so small that it will not harm anyone if you come into contact with it. Heat- By this I mean the heat which will be produced by the light bulb. Again this will not be a problem as the hot part of the bulb is the filament which is protect by a glass dome. Breakage's- This is almost solely based upon the possible breakage of the light bulb's glass dome. This should not cause any problems as most bulbs produce a rounded edge if the glass break. My Equipment:- 1 0.3amp bulb 3 3.5volt batteries 1 Variable resistor 1 Ammeter 1 Voltmeter (I will also need 6 double ended crocodile clip wires) ...read more.


There is a formula that I will use to find out the temperature. It is R = R (1 + 0.04 x ) A Fair Test:- To ensure that I carry out a fair test I must:- * Use the same equipment if I need to redo parts of the experiment later on. If I fail to do this, my results may change and become abnormal to the rest of my results. * Make sure that the batteries are fully recharged. I f this task is failed to be completed it may reduce the amount of results that I am able to acquire because of the reduction of the amount of amps. * I must repeat my results for 2 or maybe 3 times so I can find an average, therefore making my results more accurate. My Predictions:- My predictions are that when the potential difference increases the current also increases. This means the resistance increases and therefore the temperature increases as well. ...read more.


My Evaluation:- The experiment that I carried out was obviously is not completely accurate as it is only a school experiment and the school do not have the equipment or the funds to carry out a 100% accurate experiment. This version of the experiment produced a valid set of results which supported my original hypothesis. There were the odd few results which were irregular or out of the ordinary. There were not enough of these to warrant the experiment having to be redone. Changes that I would make are to find a more accurate way of recording the temperature. I think this is a problem because to find out the temperature you are basing it solely on your results from the current, potential difference and resistance. So if any of these results are wrong your temperature could be very irregular, this could also be said about the resistance. I think that the evidence that I have found supports a firm conclusion, I think this because my results support the text book results and there are no major irregularities. ?? ?? ?? ?? Derek Pollard 5M Page 1 ...read more.

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