1. ELECTRICITY BY Fathima Sabana J.Pavithra C.Priyadharshini K.V.Vidhya
STUDENTS OF THE MADRAS SEVA SADAN HR.SEC.SCHOOL, CHETPUT, CHENNAI-31.
Fathima Sabana
J.Pavithra
C.Priyadharshini
K.V.Vidhya
K.vidhya lakshmi

2. INVENTION
Thomas Alva Edison invented the electricity. He invented electric bulb, lamb,etc.
The electric light system was more than just the incandescent lamp, or "light bulb."

3. BIOGRAPHY
Thomas Alva Edison was born February 11, 1847 in Milan, Ohio (pronounced MY-lan). In 1854, when he was seven, the family moved to Michigan, where Edison spent the rest of his childhood. At the age of 12 he sold fruit, snacks and newspapers on a train as a "news butcher. He even printed his own newspaper, the Grand Trunk Herald, on a moving train .

4. ELECTRIC CIRCUITS
Electric current is the continuous flow of electrons through a conducting material . Electrons are invisible so to understand the basics of how circuits work, it helps to examine a mechanical system that behaves in many ways similar to the electric circuit.
This mechanical system consists of a pump pushing water through a closed pipe.

5. PHONOGRAPH
The phonograph was the first machine that could record the sound of someone's voice and play it back. In 1877, Edison recorded the first words on a piece of tin foil. He recited the nursery rhyme "Mary Had a Little Lamb," and the phonograph played the words back to him. This was invented by a man whose hearing was so poor that he thought of himself as "deaf"!

6. OHM'S LAW
“The amount of current flowing in a circuit made up of pure resistances is directly proportional to the electromotive forces impressed on the circuit and inversely proportional to the total resistance of the circuits
In simpler terms ohm’s Law:
A steady increase in voltage, in a circuit with constant resistance, produces a constant linear rise in current.

7. ELECTRIC CURRENT
Electric current is the rate of charge flow past a given point in an electric circuit, measured in coulombs/second which is named amperes. In most DC electric circuits, it can be assumed that the resistance to current flow is a constant so that the current in the circuit is related to voltage and resistance by ohm’s law. 

8. ELECTRIC CHARGE
The unit of electric charge is the coulomb. Ordinary matter is made up of atoms which have positively charged nuclei and negatively charged electrons surrounding them. Charge is quantized as a multiple of the electron or proton charge:

9. ELECTRIC BELL
A bell that is made to sound by closing a switch (bellpush), causing an electric current to pass through an electromagnet. This in turn causes a hammer to strike the bell and in doing so to break the circuit. The hammer then springs back to a position that again closes the circuit. The bell thus rings continuously while the switch is closed.

10. ELECTRO MAGNET
An electromagnet is a coil of wire, around an iron core, that produces magnetism as long as an electric current flows through the coil. An electromagnet's can be turned on and off, making it useful in operating electrical devices with movable magnetic parts, such as generators, motors, clutches, and other devices such as Metal detectors.
The strength of the magnetic field depends on several things,
The number of turns on the coil
The size of wire used to wind the coil
The Voltage source applied to the coil

11. REFERENCES www.allenergy.com/electricity/elecnews.html-
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REFERENCES