PRESENTATIONOFEarthing System
abstract

In electricity supply systems, an earthing system defines the electrical potential of the conductors relative to that of the Earth's conductive surface. The choice of earthing system has implications for the safety and electromagnetic compatibility of the power supply. Note that regulations for earthing (grounding) systems vary considerably among different countries.

A protective earth (PE) connection ensures that all exposed conductive surfaces are at the same elec ....etc

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SEMINER PRESENTATION ON ELECTRICAL RESISTIVITY TOMOGRAPHY ....etc

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Introduction

What is Earthing


-The process of earthing is to connect all the objects which could become charged to the general mass of the earth, to provide a path for electrical current and to hold the parts as close as possible to earth potential.
-For tying the electrical supply system to earth, supply transformer neutral conductor (Y point of 3 phase Supply) is connected to earth using an earthing electrode or the metal sheath and armouring of a buried conductor.

Why Earthing required ....etc

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system earthing seminar report with full report ....etc

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CONDUCTIVITY σ ,FERMI LEVEL ,
MEAN FREE PATH &
RELAXATION TIME ť
FOR TYPICAL MONO-VALENT METALS
IS SHOWN IN TABLE

The conductivity σ may be obtained experimentally .
Further we can get ť by using eqn given below
σ = ( n*Qe2 *ť )/me ---------(1)
but ť obtained may not be accurate but we will get an idea of magnitude of ť . In a monovalent metal no of free e- /m3 is equals the no of atoms /m3 . From table we find that relaxation time T is of the order of 10-14 sec .Thus we can ....etc

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INTRODUCTION
The meaning of the term earthing or grounding is to connect the electrical equipment to the general mass of earth by wire of negligible resistance. This brings the body of the electrical equipment to Zero potential and thus will avoid the shock to the operator. The neutral of the supply system is also solidly earthed to ensure its potential equal to Zero according to Indian Electricity Eale,[?The earthed or connected with earth means connected with the general mass of the earth in such manner as to sure at ....etc

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The use of restivity to determine the level of contaminant in groundwater ....etc

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1.The dynamic viscosity of most of the gases______________with rise in temperature.
(A)Increases(B) Decreases
(C ) Does not change significantly (D) None of these

2.)Buoyant force is___________.
(A)Resultant of up thrust and gravity forces acting on the body
(B)Resultant force on the body due to the fluid surrounding it
(C )Equal to the volume of liquid displaced by the body
(D)Resultant of static weight of body and dynamic thrust of liquid

3.)The type of flow in which the velocity of every particle varies from ....etc

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i wanna know all about chemical earthing n its definination n espically why it is done ....etc

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