Module 5: Resistivity and Temperature

Resistivity and Temperature
Module 5

Temperature of a conductor will have an effect on its resistance to current. The electrons in a metal will collide more frequently due to the increase in thermal motion characteristic of higher temperatures. This results in the average drift velocity of the electrons to decrease and therefore decreasing the current. As the drift speed increases due to larger voltages across a resistor, this will also affect the temperature of the conductor, and its ability to provide resistance.

In this lab, you will investigate additional consequences of the increase in temperature of a conductor due to increased currents and discover how this temperature is directly related to the glowing of an incandescent bulb.

Objectives

 Your objectives are to:

1. Construct a circuit using a circuit diagram schematic,
2. Record data for the voltages across an assortment of resistors and an incandescent bulb,
3. Evaluate the validity of the standard model for a power supply with an internal resistance to describe the relationships shown by your data.
4. Examine how power is dissipated across the bulb in terms of its heat conduction into the atmosphere and the light given off by an object at some temperature T.

Read the Lab Document Download Lab Document

The lab document Download lab document

contains information about how to select resistors of a certain value from the color coded bands drawn on the resistor, as well as background information that may not yet be covered by topics in your lecture course.

Download the Excel Workbook Download Excel Workbook

Your lab report will consist of downloading this template and uploading a completed workbook to Canvas. You should enter only text and values in cells that are colored green. Yellow cells should include programmed formulas for the cell to automatically calculate a value based on references to other cells in the workbook. For example "=SUM(A1:A2)" will automatically add the values in cell A1 and A2 together.

Lab Set Up and Data Collection

Lab Materials Cork Board Three thumb tacks 5 jumper wires 3 double Fahnestock clips 1 incandescent bulb IOLab and software Resistors (1000, 470, 191, 100, 75, 61.9, 51.1, 40.2, 30.1, 20.0, 10,0, 1.00)

Setup Videos