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Telegraph
Developed in the 1830s and 1840s by Samuel Morse and other inventors,the telegraph revolutionized long-distance communication.
It worked by transmitting electrical signals over a wire laid between stations -
Telephone
The landlline phone basically works by transforming sound into electrical signals,carrying it through an intricate network of cables and then transforming it back into sound on someone else's phone.
It was created by John Pierce and other inventors. -
Radio
Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frecuency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter conected to an antenna wich radiates the waves,and received by another antenna connected to a radio receiver.
It was created by Guillermo Marconi and others inventors -
Television
Television is a system for transmitting visual images and sound that are reproduced or screens,chiefly used to brodcast programs for entertainment,information and education.The television set has become a common place in many house holds,bussinesses and institutions.
It was created by John Logie Baird and others inventors -
Computer
Taking data and instructions from a user,processing the data as per instructions,and displaying or storing the process data,are the four major functions of a computer.These functions are also known as the input function,output function,and storage function,respectively.
It was created by Charles Babbage. -
Tablet
Tablet can be used for browse the Internet,check email downlad and read books,play games,watch videos,organize content,and much more.Most tablets are touch operated and are between the size of smartphone and laptop.
It was created by Alan Kay -
Mobile phone
Originally only used for voice communication,today's mobile phones provide additional services such as e-mail,Internet browsing,PDA (Personal Digital Assistant),functionality,digital camera,SMS(Short Message Service) for text messaging,games,and the ability to watch video or listen to music.
It was created by Martin Cooper and other inventors