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A telegraph is a communication system developed for the transimtion of messages over a wire. The information is transmited throug electrical current pulses, in the form of Morse Code. -
A computer is a device designed to make calculations, storing and organizing large amounts of information, finding words or pictures... or even controlling other machines. -
A telephone is an instrument desingned for the transmittion and reception of voices over a distance. -
A radio is an instrument used to listen to radio broadcasts and sending and receiving spoken messages or signals. -
A television is a device in the shape of a box with a screen. This invention receives electrical signals and transforms into moving images and sound. -
A tablet is a small, flat computer which we can control by touching it's screen or by using a special pen. Tablets are able to do what ordinary computers do, but they lack some input or output abilities. -
A mobile phone is a device conected to the phone system by radio instead of wires. It can be used anywhere its signals are received.