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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