Write a short note on the telephone department.
Answers
A telephone, also known as a phone, is a communication tool. Originally it was an electric tool transmitting analogue speech along wires. Now it is an electronic tool sending digital signals on wires or radio transmission. Using a telephone, two people who are in different places can talk to each other. Early telephones needed to be connected with wires which are called fixed or landline telephones. Modern mobile phones use radio waves.
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Answer:
A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user.
In 1876, Alexander Graham Bell was the first to be granted a United States patent for a device that produced clearly intelligible replication of the human voice at a second device.[2] This instrument was further developed by many others, and became rapidly indispensable in business, government, and in households.