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A telegraph is a communication system that sends information by making and breaking an electrical connection. It is most associated with sending electrical current pulses along a wire with Morse code encoding. -
The telephone is a small device that makes our day easier.
The phone has many functions and has been developed over time.
FUNCTIONS:
You can call anyone
You can play online and play independently.
You can take photos
You can use de calculator
You can surf internet
But in the old telephones only can call -
Radio is sound communication by radio waves, usually through the transmission of music, news, and other types of programs from single broadcast stations to multitudes of individual listeners equipped with radio receivers. -
An electronic system of transmitting transient images of fixed or moving objects together with sound over a wire or through space by apparatus that converts light and sound into electrical waves and reconverts them into visible light rays and audible sound. -
A computer is a device that accepts information (in the form of digitalized data) and manipulates it for some result based on a program, software, or sequence of instructions on how the data is to be processed. -
Flat slab of stone, clay, or wood, used especially for an inscription. -
Mobile telephone, also called mobile phone, portable device for connecting to a telecommunications network in order to transmit and receive voice, video, or other data.