Title

Effect of Temperature and Cost on Pencil Resistivity

Presenter Information

Daniel Townzen

Department

Chemistry

Major

Chemistry with Pre-Medical Emphasis

Research Advisor

Gerald, Rex

Advisor's Department

Chemistry

Funding Source

Self-Funded

Abstract

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.

Biography

Daniel Townzen is a Junior Chemistry Pre-Medical emphasis Student.

Research Category

Sciences

Presentation Type

Poster Presentation

Document Type

Poster

Location

Upper Atrium/Hall

Presentation Date

15 Apr 2015, 9:00 am - 11:45 am

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Apr 15th, 9:00 AM Apr 15th, 11:45 AM

Effect of Temperature and Cost on Pencil Resistivity

Upper Atrium/Hall

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.