저항 측정

소개

In our previous everyday life, we have usually measured the magnitude of the resistor by means of a normal resistor. However, if the object of the measure and the resister were to be far enough so that the resistance of the wire is no more negligible, then significance error in the measurement is inevitable. Therefore, here we introduce a method so called "Four Point method for measuring a resistance" in order to eliminate the error caused by the wire resistance.
Moreover, the resistance has the property such that the magnitude of the resistance depends on the temperature. Moreover, the temperature depends on the current, thereby making the relationship between the current and the applied voltage nonlinear. Here we analyze this property of a resistor

목차

Ⅰ. Preface
1. Background and Intention

Ⅱ. Theory
1. The Temperature Dependence of the Metal Resistivity : Bloch-Greneissen Formula
2. The Applicaiton of Bloch-Greneissen Formula in a Number of Specific Situations

Ⅳ. Procedure
1. Experiment 1 : Two Point and Four Point Methods for Measuring Small Resistances
2. Experiment 2 : Ohm`s Law for the Light Bulb

Ⅴ. Result and Analysis
1. Experiment 1 : Two Point and Four Point Methods for Measuring Small Resistances
2. Experiment 2 : Ohm`s Law for the Light Bulb

Ⅵ. Conclusion

본문내용

Ⅱ. Theory
1. The Temperature Dependence of the Metal Resistivity : Bloch-Greneissen Formula
Bloch-Grunessen Formula is an equation which shows how the resistivity of the metal depends on the temperature .
At the above equation, is the coefficient which depends on the velocity of electrons. is the Debye temperature obtained by measuring the specific heat. Moreover, is the constant which is determined by which interaction is responsible for the resistance.
n=5 : The resistance is subject to the electron diffraction by photons
n=3 : The resistance is subject to the s-d electron diffraction
n=2 : The resistance is subject to



From the first experiment, we could see that we can measure the magitude of resistance more preciesely if we adopt four-point measurement.
From the second experiment, we could see that the graph of the voltage versus current is nonlinear. Even though we could not directly derive the specific equation of the curve, we could anticipate that the change of the shape of the graph is due to the change in the mechanism which makes the resistance to occur. In other words, the magnitude of in Bloch-Greneissen Formula changes from 2, 3, and 5.

참고자료

· 없음