# Basic Electricity is Applied to Welding | RKSH Subham

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## Basic Electricity is Applied to Welding

Electricity :

Electricity is a kind of invisible energy which is capable of doing work such as :

— burning of lamps.

— running of fans , motors , machings etc.

— producing heat.

Electric Current

Electrons in motion is called current . The rate of flow of electrons is measured in Amperes . Hence the unit of electric current is Ampere . The measuring instrument of electric current is ampere meter or ammeter.

Electric Pressure

It is the pressure which makes the electric current to flow . It is called voltage or electromotive force ( emf ) . Its measuring unit is volt . The measuring instrument is called volt - meter .

Electric Resistance :

It is the property of a substance to appose the flow of electric current passing through a current regulator . Its measuring unit is ohm and the measuring instrument is ohmmeter or megger .

Resistance of a substance ( conductor ) depends on the :-

— Nature of the conductor .

— Length of the conductore .

— Cross - section of the conductors . — Temperature of the conductors .

Conductor

The substance through which electricity passes is called conductor . Copper , Aluminium , steet , carbon etc. are examples of conductor .

Insulator

The substance through which electricity does not pass is called insulator . Glass , Mica , Rubber , plastie , dry wood , day cotton etc. are examples of insuiare .

Alternating Current (AC)

Electric current which changes its direction and magnitute at a certain numbe of times per second is called Alternating current .

Its rate of change is called frequency i.c. Hertz ( Hz ) . In India the frequency of A.C. is 50 cycles per second . 50 cycles per second means it changes its divection 50 times per second.

Direct Current (DC)

Electric current which alwaye flows in a perticular direction is known as Direct current . Here ponticular direction means negative to positive ( electronic direction ) and positive to negative ( conventional direction ) .

Ohm's Law

It is one of the most widely applied laws of electrical science.

It is the relationship of current , roltage and resistance , which was studied in 1827 by George . S. ohom , a mathematician .

The law states :-

In an electrical circuit , at constant temperature , the curnent varies dinectly as the voltage and invensly as the resistance . i.c. current increses when voltage increase and current decreases when resistance increases .

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