DC Circuit. And there types.

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  Definition :  Direct current.                 The current that always flow in one direction is called direct current. The current supplied by A cell , battery or generator. D.C. Circuit . The closed path followed by direct current is called a d.c. circuit. A d.c. circuit essentially consist of a source of direct voltage (e.g battery), the conductors used to carry current and the load.  Shows a figure. A bulb connected to a battery through conducting wires. The direct current Starts from positive terminal of the battery 🔋🔋🔋 And comes back to the starting point via the load. Types of DC circuit 1 Resistors in Series 2 Resistors in Parallel 3 DC Series Parallel Circuit 1. Resistor in series  A number of resistors are said to be connected in series if the same current flows through each resistor and there is only one path for the current flow through out .consider three resistors of resistance R1, R2 and R3 connected in series...
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What is Resistance ? Resistance क्या हैं ?

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what is Resistance ?


Definition :   

                       The opposition offered by a substance to the flow of Electric current is called it's resistance.


Since current is the flow of free electrons, resistance is the opposition offered by the substance to the flow free electrons. this opposition occurs because atoms and molecules of the substance obstruct the flow of these electrons. Certain substance ( e.g , metals such as silver, copper, aluminium etc. )

Offer very little opposition to the flow of Electric current and are called conductor.on the other hand, those substance which offer high opposition to the flow of Electric current ( i.e. , flow of free electrons ) are called insulator.

 

(  The opposition flow of current.)


Resistance यह current को  रोकता हैं। यानी oppose करता है।

Electrical Resistors
                                 

Resistor :

                This is Electrical components to oppose the current.



Unit of Resistance :

             The practical unit of resistance is ohm is represented by the symbol.






A wire is said to have a resistance of 1 ohm if a p.d of  1 volt across its ends cause 1 ampere to flow through it.


Calculating Resistance : 


            R = PL/A


R  =   RESISTANCE

L. =   Length of material

A. =  Cross section Area

P.  =   Resistivity.  Or specific Resistance of                      material.


Resistance is directly proportional to the length of material.

And inversely proportional to the cross section of Area.


यानी conductor की length बड़ेगी तब Resistance बढ़ेगा।

जब Resistance बढ़ेगा तब area काम होगा।


Effect of Temperature.


    Temperature is increases with Resistance increase linearly .


Resistance is directly proportional to the Temperature.


जब Resistance बढ़ेगा तब Temperature भी बढ़ेगा.






         




Temperature co-efficient of resistance of a conductor is the increase in Resistance per ohm original Resistance per 'C rise in Temperature.







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