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OZONE Aim About the Project Instruction User Game Exit Division of Atmosphere What is ozone ? Formation of Ozone Layer Formation of Ozone hole Ozone Profile Safe our Ozone Layer GOVERNMENT HIGH SCHOOL, VISWANATHAM, SIVAKASI,VIRUDHUNAGAR DISTRICT, TAMILNADU, INDIA-626189 P.KARUNAIDOSS ELECTRICITY §¾÷× ELECTRICITY STD. VIII ELECTRICITY - INTRODUCTION WHAT IS ELECTRICITY ? SIMPLE ELECTRIC CIRCUIT ELECTRIC CIRCUIT SYMBOLS CONDUCTORS AND INSULATORS ORSTED RESEARCH MAGNETIC EFFECT OF CURRENT USES OF ELECTROMAGNETES ELECTRIC BELL ELECTRICITY APPLIANCES/DEVICES THAT RUN ON BATTERY STD. VIII ELECTRICITY STD. VIII APPLIANCES/DEVICES THAT RUN ON ELECTRIC POWER ELECTRICITY STD. VIII The Father of Electricity William Gilbert 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 materials ELECTRICITY STD. VIII - BATTERY + ELECTRIC CELL 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. ELECTRICITY STD. VIII - BATTERY + WHAT IS AN ELECTRIC CIRCUIT ? 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: ELECTRICITY STD. VIII - BATTERY + SIMPLE ELECTRIC CIRCUIT ELECTRICITY Parallel Electric Circuit STD. VIII Series Electric Circuit Switch 1 Switch 2 Lamp 1 Lamp 2 ELECTRICITY STD. VIII 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 ELECTRICITY Conductors and Insulators - BATTERY + Conductors STD. VIII Insulators 0 À¢Ç¡ŠÊì ÐñÎ ÃôÀ÷ ¨Á측 1 Rupee ELECTRICITY STD. VIII Wind Energy 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. ELECTRICITY STD. VIII Ørsted Research 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. ELECTRICITY STD. VIII Uses of Electromagnets Electromagnets are used in 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. ELECTRICITY STD. VIII Electric bell 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. ELECTRICITY STD. VIII Question : 1. EXAMPLE OF CONDUCTORS Click the Correct Answer 1 Answer Mica Plastic Copper Paper ELECTRICITY Question 2. STD. VIII Who found Electromagnetism Click the Correct Answer 2 Answer Paradea Orstead Ambiare Pilamming ELECTRICITY Question : 3. STD. VIII FATHER OF ELECTRICITY Click the Correct Answer 3 Answer William Gilbert Paradea Orstead Pilamming ELECTRICITY STD. VIII Which atom has Negative charge? Question : 4. Click the Correct Answer 4 Answer Proton & Neutron Proton Neutron Electron ELECTRICITY Question : 5. Symbol of Battery Click the Correct Answer Answer 5 1 BACK 1 BACK 2 BACK 2 BACK 3 BACK 3 BACK 4 BACK 4 BACK 5 BACK 5 BACK ELECTRICITY STD. VIII
