Carbon Putty

... Reading 5 ( ú[ ) Average ( ú[ ) 10 8.4 8.9 8.8 8.2 8.5 8.6 9 6.8 7.3 6.7 6.4 6.5 6.7 8 6 6.2 5.2 5.4 5.6 5.6 7 4.8 4.3 4.3 4.8 4.2 4.5 6 3.4 3.8 4.1 3.9 3.8 3.8 5 3.6 3.1 4 4.3 3.8 3.9

In the experiment to investigate whether cross-section area has affect on the resistance of the carbon putty, I was trying to keep the factors below constant: The resistance of the wire The contact resistance between the 2p coin and the putty The length of the putty used The voltage across the putty

In this experiment I keep the length constant to 8 cm, it was difficult to get the diameter I wanted with a constant interval, and therefore I was just trying to get 3 cm and 1.5 cm as this is the one I will use in my analysis Diameter ( cm ) Reading 1 ( ú[ ) Reading 2 ( ú[ ) Reading 3 ( ú[ ) Reading 4 ( ú[ ) Reading 5 ( ú[ ) Average ( ú[ ) 3 4.5 4.7 4.3 4.6 4.3 4.5 2.7 5.2 4.5 4.9 5.1 5.2 4.9 2.5 7.1 6.0 6.2 6.2 6.2 6.2 2.2 13.2 12.9 11.8 11.7 9.8 11.8 1.8 13.4 13.9 13.5 12.5 13.3 13.3 1.5 15.4 14 14.8 14.9 14.6 14.9

To find out the cross section area from the diameter I was using this formula:

Cross section area: âÓr2

For example: The diameter is 3 cm The cross section area is therefore âÓ* 1.52 = 7.07 Cross section area (cm2) I/ A ( 1/cm2) Resistance Reading 1( ú[ ) Resistance Reading 2 ( ú[ ) Resistance Reading 3 ( ú[ ) Resistance Reading 4 ( ú[ ) Resistance Reading 5 ( ú[ ) Resistance Reading Average ( ú[ ) ...