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OZONEOZONEAim About the Project Game ExitInstruction User

P.KARUNAIDOSS

GOVERNMENT HIGH SCHOOL, VISWANATHAM,

SIVAKASI,VIRUDHUNAGAR DISTRICT, TAMILNADU, INDIA-626189

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ELECTRICITYELECTRICITY

ELECTRICITY - INTRODUCTIONELECTRICITY - 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 BELLELECTRIC BELL

ELECTRICITY STD. VIII

APPLIANCES/DEVICES THAT RUN ON BATTERY

ELECTRICITY STD. VIII

APPLIANCES/DEVICES THAT RUN ON ELECTRIC POWER

ELECTRICITY STD. VIII

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

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.

- B

ATTER

Y

+

ELECTRIC CELL

ELECTRICITY STD. VIII

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:-

BA

TTER

Y

+

WHAT IS AN ELECTRIC CIRCUIT ?

ELECTRICITY STD. VIII

-

BA

TTER

Y

+

SIMPLE ELECTRIC CIRCUIT

ELECTRICITY STD. VIII

Lamp 1 Lamp 2

Switch 1 Switch 2

Parallel Electric Circuit Series Electric Circuit

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 STD. VIII

Conductors and Insulators

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Conductors

Insulators

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ATTE

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ELECTRICITY STD. VIII

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

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

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

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

Mica

Plastic

Copper

Paper

1Answer

EXAMPLE OF CONDUCTORSQuestion : 1.

ELECTRICITY STD. VIII

Click the Correct Answer

Paradea

Ambiare

Orstead

Pilamming

2Answer

Question 2. Who found Electromagnetism

ELECTRICITY STD. VIII

Click the Correct Answer

Paradea

Orstead

William Gilbert

Pilamming

3Answer

Question : 3.

ELECTRICITY STD. VIII

FATHER OF ELECTRICITY

Click the Correct Answer

4

Proton

Neutron

Proton & Neutron

Electron

Click the Correct Answer

Answer

Question : 4. Which atom has Negative charge?

ELECTRICITY STD. VIII

5

ELECTRICITY

Click the Correct Answer

Answer

Question : 5. Symbol of Battery

1

BACK

1

BACK

2

BACK

BACK

2

3

BACK

BACK

3

4

BACK

BACK

4

5

BACK

BACK

5

ELECTRICITY STD. VIII