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Practical Assessment for Physics: Investigating the Resistance of Conducting Putty.

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Introduction

Practical Assessment for Physics: Investigating the Resistance of Conducting Putty Possible Variables: Thickness, Length, Temperature. Variable to be investigated: Length as it is the most reliable way of creating a fair test. Aim: To see how the variable lengths of the conducting putty will affect the resistants in the circuit. Prediction: I predict an increase in the length of the putty will increase the resistants in the circuit. This is because there is a bigger area for the charges to travel through, with less chance of a collision. I came to this conclusion of my prediction by collecting evidence from an 'AS/A2 Physics' book by Wendy Brown. ...read more.

Middle

(3) I then placed the tip of the copper on each ends of the 1cm putty coil as shown in my diagram. As I was doing this I recorded the voltage reading into a table and disconnected the copper from the putty. I repeated this ten times and collected ten voltage readings for this length of putty. But between each reading I waited for a few seconds so that the temperature would be the same at each reading making it a fair test. I then did exactly the same for recording the results form the amp meter. (4) I repeated stage (3) for the other lengths of putty to have all the readings in my results table. ...read more.

Conclusion

5.63 8 4.36 4.65 5.13 5.36 5.57 9 4.25 4.73 5.06 5.35 5.65 10 4.29 4.70 5.09 5.36 5.62 AVERAGE 4.315 4.725 5.084 5.349 5.596 CURRENT READING Reading No. 1cm 3cm 5cm 7cm 9cm 1 0.44 0.24 0.18 0.13 0.11 2 0.39 0.25 0.17 0.11 0.09 3 0.42 0.23 0.19 0.11 0.10 4 0.43 0.28 0.20 0.14 0.11 5 0.44 0.25 0.22 0.13 0.11 6 0.40 0.27 0.17 0.14 0.10 7 0.41 0.28 0.19 0.12 0.09 8 0.44 0.26 0.21 0.14 0.10 9 0.43 0.24 0.16 0.13 0.11 10 0.44 0.27 0.19 0.14 0.09 AVERAGE 0.424 0.257 0.188 0.129 0.101 RESISTANTS (VOLTAGE AVERAGE DIVIDED BY CURRENT AVERAGE) 1cm 3cm 5cm 7cm 9cm 10.1769 18.3852 27.0426 41.4651 55.4059 Conclusion: Sohail Deen 11H 29/01/03 1/4 ...read more.

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