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The telegraph revolutionized long-distance communication. It worked by transmitting electrical signals over a wire laid between stations -
A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables -
A radio is used to convey information from one place to another through the intervening media. -
A television is a system for transmitting visual images and sound that are reproduced on screens. -
The function of a computer is taking data and instructions from a user, processing the data as per instructions, and displaying or storing the processed data. -
Tablets can be used to browse the Internet, check email, download and read books, play games, watch videos, organize content, and much more -
The primary function of a mobile phone is voice communication, mobile phones allow one user to call another and talk from afar.