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It worked by transmitting electrical signals over a wire laid between stations.
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A telephone is an instrument designed for the simultaneous transmission and reception of the human voice. -
The prime purpose of radio is to convey information from one place to another through the intervening media. -
Television, sometimes shortened to TV or telly, is a telecommunication medium used for transmitting moving images in monochrome. -
Computers are used to control large and small machines which in the past were controlled by humans. -
Mobile phones are used for a variety of purposes, such as keeping in touch with family members, for conducting business, and in order to have access to a telephone in the event of an emergency. -
Tablets are simple and convenient to use. They provide an accurately measured dosage of the active ingredient in a convenient portable package, and can be designed to protect unstable medications or disguise unpalatable ingredients.
