 |
| Dry cell |
1.16 Sources of electricity :
We get electricity from a variety of methods. We generate elecricity by running electric generators with the help of water, wind and steam energy. Solar energy is converted into electricity by solar cells. Cells and batteries are also the sources of electricity These batteries convert chemical energy to electrical energy.
We get electricity from a variety of methods. We generate elecricity by running electric generators with the help of water, wind and steam energy. Solar energy is converted into electricity by solar cells. Cells and batteries are also the sources of electricity These batteries convert chemical energy to electrical energy.
Do you know ?
Tube lights use less electrical energy and emit more light than bulbs of same power Less heat is produced in tube lights. Hence the wastage of electricity is less in these lighs. Now-a-days electric lamps based on CFT are in use. They work well even when the voltage is low. Such bulbs are useful in saving electricity. (CFT : Compact Fluoresent Tube)
Electric Cell :
Electric cell is a device that converts chemical energy into electrical energy. This is called a generating cell. It consists of two elecrodes kept in a suitable electrolytic mixture. One electrode becomes positive whereas another becomes negative. When these electrodes are connected by a conducting wire. Electrons flow from negatives to positive. But the flow of current is indicated from positive to negative.
Electric cell is a device that converts chemical energy into electrical energy. This is called a generating cell. It consists of two elecrodes kept in a suitable electrolytic mixture. One electrode becomes positive whereas another becomes negative. When these electrodes are connected by a conducting wire. Electrons flow from negatives to positive. But the flow of current is indicated from positive to negative.
Dry Cell :
A dry cell consists of a graphite rod erected at the centre of a zinc can. A layer of a mixture of carbon powder and manganese dioxide surrounds the graphite rod. The space between the layer and the walls of zinc can is filled with a paste of ammonium chloride and zine chloride. Zinc can is sealed with resin. The top visible end of graphite rod is fitted with a brass cap. Graphite rod acts as positive pole and zinc can acts as negative pole. Ammonium chloride is the electrolyte. When the dry cell is connected to a circuit the current flows from the positive pole to the negative pole. The effective life of a dry cell is very short. Now-a-days, long lasting cells are being used. Nickel-Cadmium cells are examples of such cells.
A dry cell consists of a graphite rod erected at the centre of a zinc can. A layer of a mixture of carbon powder and manganese dioxide surrounds the graphite rod. The space between the layer and the walls of zinc can is filled with a paste of ammonium chloride and zine chloride. Zinc can is sealed with resin. The top visible end of graphite rod is fitted with a brass cap. Graphite rod acts as positive pole and zinc can acts as negative pole. Ammonium chloride is the electrolyte. When the dry cell is connected to a circuit the current flows from the positive pole to the negative pole. The effective life of a dry cell is very short. Now-a-days, long lasting cells are being used. Nickel-Cadmium cells are examples of such cells.
No comments:
Post a Comment