Ohm's Law Experiment: Verifying Linearity through Current-Resistance Relation, Study notes of Law

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Amr Essam Wasfy

Contents

 Introduction

 Objectives

 Equipment

 Steps

 Results

 Comments

Amr Essam Wasfy

Introduction

Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them.[1]

The mathematical equation that describes this relationship is:[2]

Where I is the current through the resistance in units of amperes, V is the potential difference measured across the resistance in units of volts, and R is the resistance of the conductor in units of ohms. More specifically, Ohm's law states that the R in this relation is constant, independent of the current.[3]

The law was named after the German physicist Georg Ohm, who, in a treatise published in 1827, described measurements of applied voltage and current through simple electrical circuits containing various lengths of wire. He

Amr Essam Wasfy

Figure (1)

Steps

 First we have to know the value of the resistance. There are two ways to know the value of the resistance the first is to use the Avommeter to measure the value of the resistance, the second way is to use the colors painted on each resistance to know its value by using the data shown in figure (2).

Amr Essam Wasfy

Figure (2) Page 5

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Results

By measuring R=0.

Slope = =0.66 kΩ 0.69 kΩ

V 0 2 4 6 8 10

I 0 3 5.84 8.87 11.73 14.

Amr Essam Wasfy

Comments

There should be an error between calculating and measurements when we

measured the resistance it was 0.69 kΩ and

when we calculated it from the grave it

was 0.66 kΩ so the percent of the

error here is 4.3%.