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In this experiment we had to investigate how the power dissipation of a filament lamp varied with different potential differences across the circuit.

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Experiment to find the relationship between power

Applied and potential difference


        In this experiment we had to investigate how the power dissipation of a filament lamp varied with different potential differences across the circuit. Also to find a relationship between the power and potential difference, from this information draw a graph and collect suitable results.


        I connected a power supply to a filament lamp (10v maximum output) this was then connected to an amp meter this was then connected back to the power supply.

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From this we then calculated the power by multiplying the current by the potential differences. And then on excel working out the log of volts and the log of power and composing a graph.


        The result from this experiment shows that there is a linear relationship between the voltage across the circuit and the power. The graph produced is a straight line graph that goes through the origin. On my graph there are some anomalies  but these are very small variations that are not along the trend line for example log p= 1.0 and log v= 0.

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        The experiment was quite simple and had hardly any problems with it how ever if I was to repeat the experiment I would look into improving the sensitivity of the experiment that I used, because or though the experiment was appropriate I would like to make my calculations and readings more accurate therefore not having any anomalies results on my graph. This could be done by increasing the scale the volt and amp meter sensitivity therefore reading smaller changes in volt or amps.

                        By Stuart Norris

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