Effect of Temperature and Cost on Pencil Resistivity

In this experiment resistivities of five different brands of pencils were measured using a circuit and a digital multimeter. These resistivities were obtained in order to assess whether or not the cost of a pencil can be used to estimate its resistivity and graphite composition. Experimental data suggests that there is little to no correlation between the cost of different brands of pencils and their resistivities even if resistivities did vary between brands. Temperature was also analyzed in order to assess whether or not it had an effect on the pencil’s resistivity. One pencil was kept at 294.26K, 334.15K, and 77.2K. Resistivity was calculated from resistance gathered through the direct use of a digital multimeter. Resistivity did weakly negatively correlate to the pencil’s resistivity