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Notes of Electricity

                                                            ELECTRICITY

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Short notes:

* Electric current and circuit

* Electric potential and potential difference 

* Circuit Diagram

* Ohm's Law

*Combination of Resistance

* Series combination of resistance

* parallel combination of resistance

* Heating Effect of electric current 

*  Electric power


1) Electric current and circuit:

                  

     I= Q/t

where I= electric current

         Q= charge

         t= time

S.I unit of  , I= ampere

                   Q= coulomb

                    t= sec

2)Electric potential and potential difference :

 V= W/ Q

where  V = potential  difference

            w= work

             Q= charge

S.I unit of  V= volt

                  w= joule

                  Q= coulomb

3) Circuit Diagram:

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4) Ohm's Law :

         V= IR

=> R= V/I

=>I= V/R

 where  V = potential difference 

             R= Resistance 

              I= Electric current

 S.I unit of  R=  ohm

5) Combination of Resistance : It is of two types ,

i.e   i) Series combination of resistance

       ii) parallel combination of resistance

i) Series combination of resistance:

 R= R1+R2+R3+R4---------+Rn

  ii) parallel combination of resistance

1/R=1/ R1  + 1/R2  + 1/ R3   + -------- + 1/Rn


6)  Heating Effect of electric current :

P= VI

where I= Q/t

P= VQ/ t

=> H= VIt

where H = heat

7)  Electric power :

P= VI

 where p = power

 S.I of  p= watt

notes:

 1kw= 1000w

                 





               

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