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Computer, Charles Babbage
What is a computer? A computer is an electronic device that manipulates information, or data.
How does it work?It takes information or data from one end, store it to process, and finally, after completing the processing, it output the result on the other hand.
What is a computer for?In the computer you can do a lot of things, like search in internet,send messages,etc. -
Telegraph, Samuel Morse
What is a telegraph?
A Telegraph is a communication system that sends information by making and breaking an electrical connection.
How does it work ? A telegraph works by transmitting electrical signals over wires. A telegraph has both a transmitter and a receiver.
What is a telegraph for? You have to press a button to write in morse. -
Telephone, Alexander Graham Belt
What is a telephone? A telephone is a system for transmiting voices over a distance using wire o radio.
How does it work? A telephone work sending signals to telephone towers using RF waves.
What is a telephone for? A telephone is for call, send messages and search in internet -
Radio,Guillermo Marconi
What is a radio? The wireless transmission and reception of electric impulses or signals by means of electromagnetic waves.
How does it work? Radio works by transmitting and receiving electromagnetic waves.
What is a radio for? Usually through the transmission of music, news, and other types. -
Television,Philo Farnsworth
What is a television? An electronic system of transmiting transient images of fixed or moving objects together with sounds over a wire or through space by apparatus that converts light and sound into electrical wawes.
How does it works? A standard Tv set turns the video signal into beams of tiny particles called electrons.
What is a telephone for? Television is a system for transmitting visual images and sound that are reproduced on screens. -
Tablet,Alan Kay
What is a tablet?A tablet is a wireless touch screen personal computer that is smaller than a notebook but larger than a smartphone.
How does it work?ablets work in very much the same way that most electronics work, especially computers and smartphones.
What is a tablet for? They can browse the Internet, connect to social network apps, and display HD videos. -
Mobile Phone, Martin Cooper
What is a mobile phone?A wireless handheld device that allows users to make and receive calls.
How does it work?The sound waves are carried to a thin metal disk inside the phone, called a diaphragm, and are converted into electrical energy.
What is a mobile phone for?A wireless to call and send messages.