2. What is ozone ? Formation of Ozone Layer Formation of Ozone hole Safe our Ozone Layer Ozone Profile Division of Atmosphere OZONE Aim About the Project GameExit Instruction User P.KARUNAIDOSS GOVERNMENT HIGH SCHOOL, VISWANATHAM, SIVAKASI,VIRUDHUNAGAR DISTRICT, TAMILNADU, INDIA-626189

3. §¾÷×ELECTRICITY

4. ELECTRICITY - INTRODUCTION ELECTRICITY - INTRODUCTION SIMPLE ELECTRIC CIRCUIT WHAT IS ELECTRICITY ? WHAT IS ELECTRICITY ? ELECTRIC CIRCUIT SYMBOLS CONDUCTORS AND INSULATORS ORSTED RESEARCH MAGNETIC EFFECT OF CURRENT USES OF ELECTROMAGNETES ELECTRIC BELL ELECTRIC BELL ELECTRICITY STD. VIII

5. APPLIANCES/DEVICES THAT RUN ON BATTERY ELECTRICITY STD. VIII

6. APPLIANCES/DEVICES THAT RUN ON ELECTRIC POWER ELECTRICITY STD. VIII

7. Gilbert was the first to use it to mean "like amber in its attractive properties". He recognized that friction with these objects removed a so-called effluvium, which would cause the attraction effect in returning to the object, though he did not realize that this substance (electric charge) was universal to all materialsfrictionelectric charge William Gilbert The Father of Electricity ELECTRICITY STD. VIII

8. An electric cell is a device which converts chemical energy into electric energy. The cell has two different metal plates – one is the positive terminal and the other is the negative terminal. These plates are kept inside a chemical called electrolyte. The cell is a source of electric current. Electric current is the flow of electrons or charge. - BATTERY + ELECTRIC CELL ELECTRICITY STD. VIII

9. An electric circuit is the closed path along which electric current flows from the positive terminal to the negative terminal of the battery. A circuit with a cell and a bulb is given here: - BATTERY + WHAT IS AN ELECTRIC CIRCUIT ? ELECTRICITY STD. VIII

10. - BATTERY + SIMPLE ELECTRIC CIRCUIT ELECTRICITY STD. VIII

11. Lamp 1Lamp 2 Switch 1Switch 2 Parallel Electric CircuitSeries Electric Circuit ELECTRICITY STD. VIII

12. Why symbols? If you were to describe an electric circuit to someone, it is likely that you would want to draw it. It takes time to draw a circuit, because people might draw batteries, bulbs, etc., in different ways. This could be very confusing. This can be overcome if we use standard symbols to draw a circuit. ELECTRICITY STD. VIII

14. Conductors and Insulators 1 Rupee ÃôÀ÷ ¨Á측 Conductors Insulators - BATTERY + 0 À¢Ç¡ŠÊì ÐñÎ ELECTRICITY STD. VIII

15. Tamilnadu Leads Wind energy is an important free, renewable, clean and non-polluting energy source. In a wind farm, huge wind mills convert wind energy into electric energy. Tamil Nadu is the No.1 state in India with the highest wind power generating capacity of about 5,000MW. Most wind farms are in Thoothukudi, Kanyakumari and Thirunelveli Districts of Tamilnadu. Wind Energy ELECTRICITY STD. VIII

16. On 21 April 1820, during a lecture, Ørsted noticed a compass needle deflected from magnetic north when an electric current from a battery was switched on and off, confirming a direct relationship between electricity and magnetism. Ørsted Research ELECTRICITY STD. VIII

17. Electromagnetsareusedin many appliances like electric motor, Telegraph, Telephones, Electric bell, etc. Many toys have electromagnets inside. Doctors use small electromagnets to take out tiny pieces of magnetic materials that have accidentally entered the eye. Uses of Electromagnets ELECTRICITY STD. VIII

18. An electric bell is a mechanical bell that functions by means of an electromagnet. When an electric current is applied, it produces a repetitive buzzing or clanging sound. Electric bells have been widely used at railroad crossings, in telephones, fire and burglar alarms, as school bells, doorbells, and alarms in industrial plants, but they are now being widely replaced with electronic sounders. Electric bell ELECTRICITY STD. VIII

19. Mica Plastic Copper Paper 1 Answer EXAMPLE OF CONDUCTORS Question : 1. ELECTRICITY STD. VIII Click the Correct Answer

20. Paradea Ambiare Orstead Pilamming 2 Answer Question 2. Who found Electromagnetism ELECTRICITY STD. VIII Click the Correct Answer

21. Paradea Orstead William Gilbert Pilamming 3 Answer Question : 3. ELECTRICITY STD. VIII FATHER OF ELECTRICITY Click the Correct Answer

22. 4 Proton Neutron Proton & Neutron Electron Click the Correct Answer Answer Question : 4. Which atom has Negative charge? ELECTRICITY STD. VIII

23. 5 ELECTRICITY Click the Correct Answer Answer Question : 5. Symbol of Battery

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34. ELECTRICITY STD. VIII