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TELEGRAPH
A telegraph is a communications system in which information is transmitted over a wire through a series of electrical current pulses, usually in the form of Morse code. ... The telegraph has been in use for more than 150 years. -
telephone
The telephone is the electrical system of communication that you use to talk directly to someone else in a different place. -
TELEVISION
television is an electronic device used to receive sound and images which create television programs that people watch -
RADIO
the transmission and reception of electromagnetic waves of radio frequency, especially those carrying sound messages. -
COMPUTER
an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program. -
TABLET
A tablet computer, commonly shortened to tablet, is a mobile device, typically with a mobile operating system and touchscreen display processing circuitry, and a rechargeable battery in a single, thin and flat package. -
MOBILE TELEPHONE
a telephone with access to a cellular radio system so it can be used over a wide area, without a physical connection to a network.
