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COMPUTER- Charles Babbage
A computer, a digital information-processing machine, works by changing information into binary numbers (ones and zeros) and then using simple mathematics to make decisions about how to rearrange those numbers into words or actions. -
TELEGRAPH- Joseph Henry
A telegraph works by transmitting electrical signals over wires. A telegraph has both a transmitter and a receiver. The transmitter is the telegraph or transmission key. Wires connect the transmitter and receiver. -
TELEPHONE- Alexander Graham Bell
The sound waves are carried to a thin metal disk inside the phone, called a diaphragm, and are converted into electrical energy. The electrical energy travels over wires to another phone and is converted from electrical energy to sound waves again which can be heard by someone on the other end of the phone -
RADIO- Guglielmo Marconi
Radio works by transmitting and receiving electromagnetic waves. The radio signal is an electronic current moving back and forth very quickly. A transmitter radiates this field outward via an antenna; a receiver then picks up the field and translates it to the sounds heard through the radio. -
TELEVISION- Philo Tylor Farnsworth
A standard TV set turns the video signal into beams of tiny particles called electrons. It shoots these beams at the back of the screen through a picture tube. The beams “paint” the pixels on the screen in a series of rows to form the picture. -
TABLET- Alan Kay
Tablets work in very much the same way that most electronics work, especially computers and smartphones. They have a screen, are powered by a rechargeable battery, often include a built-in camera, and can store all kinds of files. -
MOBILE PHONE- Martin Cooper
A microchip in the phone modulates a radio wave using the electrical signal. The radio wave travels through the air to a nearby cell tower; the tower sends your voice to the person you are calling and the process is reversed so that the person on the other end can hear your voice.