In the past, whenever there was darkness, all the people used to light the lamps in the houses. But now the house lights up as soon as a switch is turned on, why is this? So this is due to electricity. Now a days We used electricity anywhere like on strict lamp is used, in home appliances we used electricity. The light shines outside in the rainy season this is nothing but an electricity. In this chapter we will learn about Electricity and Circuit.
Electric cell:
One day it was raining heavily and Shubham’s house went into electricity, then it got dark all over. At that time Shubham’s mother was working in the kitchen. Due to the darkness, mother asked Shubham to bring torch. Shubham did torch on and the whole house lit up. After some time the electricity came on, then Shubham switched off the torch, then the lights stopped coming out of it. So why did she ask for this, she asked her mother, “Why did this happen”? Then the mother said that this happened because of the electric cell behind the torch.
Electric cell is a device which generate electricity. In cell there are two terminals, one end of cell is positive terminal and another end is show negative terminal of a cell. Positive terminal mounted by metal and negative terminal is plane metallic disc. Electric cell is used in very appliances like torch, watches, trimmer, mobile, pocket radio, alarm clock, camera etc. This cell are also called dry cell. Use of electric cell only at one time, after a particular time this cells are dead.
Activity
Take two long copper wire, electric cell, small bulb and two crocodile pins. Positive terminal of bulb connect to positive terminal of cell through copper wire and negative terminal of bulb connect to negative terminal of cell using wire. Now observe what will be the happen. It starts to glow a bulb. Now change the position of terminal, positive terminal of cell connect negative terminal and Negative terminal of cell connect positive terminal of bulb. And observe what happens then. It seen that there no bulb has glow.
From this activity it is clear that, positive terminal of cell is always connected with positive side and negative terminal of cell is connected to negative sides.
Q1 What is basic difference between battery and electric cell?
Ans. If there is only one cell is in use then it is electric cell and battery consist of two or more electric cell together.
Q2 Why electric cells are dead in an after particular period?
Ans : Because electric cell work on chemicals reaction. It convert chemical energy into electrical energy.