What is ozone ?
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What is ozone ?Formation of Ozone Layer Formation of Ozone hole
Safe our Ozone Layer
Ozone Profile
Division of Atmosphere
OZONEOZONEAim About the Project Game ExitInstruction User
P.KARUNAIDOSS
GOVERNMENT HIGH SCHOOL, VISWANATHAM,
SIVAKASI,VIRUDHUNAGAR DISTRICT, TAMILNADU, INDIA-626189
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§¾÷×ELECTRICITYELECTRICITY
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ELECTRICITY - INTRODUCTIONELECTRICITY - INTRODUCTION
SIMPLE ELECTRIC CIRCUITWHAT IS ELECTRICITY ?WHAT IS ELECTRICITY ?
ELECTRIC CIRCUIT SYMBOLSCONDUCTORS AND INSULATORS
ORSTED RESEARCHMAGNETIC EFFECT OF CURRENT
USES OF ELECTROMAGNETESELECTRIC BELLELECTRIC BELL
ELECTRICITY STD. VIII
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APPLIANCES/DEVICES THAT RUN ON BATTERY
ELECTRICITY STD. VIII
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APPLIANCES/DEVICES THAT RUN ON ELECTRIC POWER
ELECTRICITY STD. VIII
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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
William Gilbert
The Father of Electricity
ELECTRICITY STD. VIII
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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.
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TTER
Y +
ELECTRIC CELL
ELECTRICITY STD. VIII
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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:-
BATT
ERY
+
WHAT IS AN ELECTRIC CIRCUIT ?
ELECTRICITY STD. VIII
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- BA
TTER
Y +
SIMPLE ELECTRIC CIRCUIT
ELECTRICITY STD. VIII
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Lamp 1 Lamp 2
Switch 1 Switch 2
Parallel Electric Circuit Series Electric Circuit
ELECTRICITY STD. VIII
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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
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ELECTRICITY STD. VIII
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Conductors and Insulators
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Conductors
Insulators
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ELECTRICITY STD. VIII
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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
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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
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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.
Uses of Electromagnets
ELECTRICITY STD. VIII
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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
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Mica
Plastic
Copper
Paper
1Answer
EXAMPLE OF CONDUCTORSQuestion : 1.
ELECTRICITY STD. VIII
Click the Correct Answer
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Paradea
Ambiare
Orstead
Pilamming
2Answer
Question 2. Who found Electromagnetism
ELECTRICITY STD. VIII
Click the Correct Answer
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Paradea
Orstead
William Gilbert
Pilamming
3Answer
Question : 3.
ELECTRICITY STD. VIII
FATHER OF ELECTRICITYClick the Correct Answer
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4
Proton
Neutron
Proton & Neutron
Electron
Click the Correct Answer
Answer
Question : 4. Which atom has Negative charge?
ELECTRICITY STD. VIII
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5
ELECTRICITY
Click the Correct Answer
Answer
Question : 5. Symbol of Battery
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1
BACK
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BACK
2
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3
BACK
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3
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4
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5
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ELECTRICITY STD. VIII