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# Investigating the voltage variation with the angular position of a rotating potential divider

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Introduction

Investigating the voltage variation with the angular position of a rotating potential divider Plan In this experiment I am going to investigate how the voltage changes with the angular position of a rotating potential divider. The apparatus that I will need are: * Voltmeter * Power supply * Wires * 3600 paper protractor * Potential divider * Lamp I will be measuring the voltage and not down the readings at different angles on the potential divider. The readings for the angles will start at 00 and go up to 3000 in increments of 200. The voltage being supplied form the power source will be constant at 5V. I placed a circle paper protractor on top of the shaft of the potential divider and also a pin. I will use this pin to help me indicate at what angle I am working with. I will connect the potentiometer's ends across the power supply and measure the potential difference between one end and the terminal connected to the sliding contact. ...read more.

Middle

The shaft is connected to the angular slider and so when you turn it you will change the angle. This increases or decreases the voltage. The diagram shows a potentiometer in more detail. Observations The results have been recorded in the table below. As explained earlier, I have repeated this experiment three different times and so have three readings. Hence, I have taken an average voltage reading in order to plot a graph. Angle (Degrees) Voltage Readings (V) Average Volatge V 1 V 2 V 3 0 0.00 0.00 0.00 0.00 20 0.00 0.00 0.00 0.00 40 0.05 0.05 0.05 0.05 60 0.12 0.12 0.11 0.12 80 0.19 0.18 0.18 0.18 100 0.25 0.25 0.24 0.25 120 0.32 0.32 0.30 0.31 140 0.39 0.38 0.38 0.38 160 0.46 0.45 0.45 0.45 180 0.54 0.53 0.53 0.53 200 0.87 0.72 0.72 0.77 220 1.84 1.75 1.79 1.79 240 2.73 2.72 2.72 2.72 260 3.78 3.80 3.84 3.81 280 4.93 4.94 4.94 4.94 300 4.98 4.98 4.98 4.98 Analysis The graph below has been plotted with respect to the angle of a potential divider and the voltage produced at the angle. ...read more.

Conclusion

From analysing the graph I can say that the experiment went fairly well and a smooth curve is plotted. However, the graph is not perfectly a curve and this is because of human error. As I changed the angle of the potentiometer I had to make sure that it was accurately on a multiple of 20. However, this could only be done by human judgement so therefore there could be an error of about 1-2 degrees. This has not affected my results in such a way that I have any anomalous results. The log graph proves that there is a relationship between the angle of a potentiometer and it's potential. This can be seen by the almost straight line produced. As I have mentioned before, the line is not perfect as there was inaccuracy in measuring the angles. If I was to repeat this experiment again I would use something that is more precise in telling me what the angle of the potentiometer was. In this experiment the controlled variable was the angle. I could also have controlled the voltage and then worked out which angle gives certain voltages. ?? ?? ?? ?? Gurnam Singh Virdi - 1 - ...read more.

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