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

Introduction

        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.

Method

        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. The voltmeter was connected in parallel.

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        Then I set the power supply to 0v then turned it on then increased the voltage in 1 volt stages starting at 1 volt and finishing at 8v taking the readings from the amp meter and recording them on a table. I repeated this part twice to make sure my readings where accurate and also to give me and average reading.

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.

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