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A computer is a system made up of programs and electronic elements, which together allow processing and ordering information. The programs are known as Software and the electronic elements as Hardware. -
The telegraph is an apparatus or device that uses electrical signals for the transmission of coded text messages, such as Morse code, through wire lines or radio communications.
It works by means of the emission and reception of electrical signals, the system proposed by the telegraph is based on the transmission of text messages. -
The telephone is a telecommunication device created to transmit acoustic signals at a distance by means of electrical signals.
The telephone works in such a way that the sound is transformed into electrical energy, it is transported through the cables and transformed back into sound in another telephone located on the other side in the distance. -
Radio is a means of communication that is based on sending audio signals through radio waves, although the term is also used for other forms of remote audio delivery such as Internet radio. -
Television is a system for transmitting images and sound at a distance through Hertzian waves. In the case of cable television, the transmission takes place through a specialized network. -
Tablets use a touch-sensitive screen so you can type and navigate quickly. They are characterized by being very light and are cheaper than a computer. In addition, they are more practical, since all their handling is done with the fingers. -
Cell phones work by sending signals (and receiving signals) to cell phone towers (base stations) using RF waves. This is a form of electromagnetic energy that lies between FM radio waves and microwaves.