Electricity Blog 2

Electricity

Utilize your second period in completing the previous work
Good morning students

Today we will make an effort to --

Develop meaning of potential difference and its unit

Continuing with what was given as Home Assignment

Current I = 10 A

Time = 2 minutes = 2 × 60 = 120 sec

(a) Then charge Q = I × t = 10 × 120 = 1200 C

(b) Number of electrons = 1200 C x 1/ 1.6×10−19 


                                              = 7.5 x 10−17

Let us begin today's lesson

The electric charge is equal to the number of electrons in it 

and the magnitude of charge on the electron i.e.


Q = ne



where n = number of electrons and

e = charge of electron which is = 1.6 x 10-19 C 

         

Q. Calculate number of electrons in 1C of charge




Ans)    Q= ne


           Q= 1C
    
           1 = n x 1.6 x 10-19



         n = 6.25 x 1018
Therefore, we can define  1C  as :
1C is that charge which contains 6.25 x 1018  number of 




electrons in it.
















One coulomb is equal to the quantity of charge that passes 



through a cross-section of a conductor in one second, given 



a current of one ampere.




























Potential Difference

















VIDEO ----    Excellent Explanation Do click here








Work done per unit charge in taking charge from one point to 



another is known as Potential Difference. 



The unit of potential difference is volt (V).



1V is defined as the potential difference between two points 



if 1 Joule of work is done to move 1 coulomb charge 




from one point to another.



i.e. V= W (from one point to another)            
            q

1V =   1 joule          
        1 coulomb




Voltmeter :
The instrument that is used to measure potential 



difference between two points in an electric circuit 









Ammeter :

It is  an instrument used to measure the current flowing in an 

electric circuit .






The work done in moving a charge of 5 coulombs from a point at 230 volts to another point at 240  volts is.










A .


50J




B .


15J




C .


100J




D .


500J






Refer to page 202  Example 12.2.



Answer will be discussed tomorrow








Read the chapter further and do some research so as to 
















answer the following.We will do it tomorrow













Q)  How can we get continuous flow of current in a 

circuit?



Ans) We can get continuous flow of current in a circuit by 

maintaining a potential difference between the 2 ends of a 

conductor. We can do that by connecting it to a battery or cell

because there are two terminals that are always at different 

potential levels.

WE WILL DISCUSS THE MEANING OF THE WORD 

RESISTANCE TOMORROW

HOME ASSIGNMENT :

Read page 201-202

Intext Questions on page 202

Keep Smiling
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