"Telegraph and Telephone" Information Transmission PPT Courseware 2

Category	Format	Size
Hunan Education Edition Fourth Grade Science Volume 1	pptx	6 MB

"Telegraph and Telephone" Information Transmission PPT Courseware 2

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Upload Time: 2024-09-30

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"Telegraph and Telephone" Information Transmission PPT Courseware 2

How can we quickly transmit long-distance information?

After three years of study by the American painter Morse, the first telegraph machine came out in 1837. Morse successfully used the "on", "off" and "long break" of electric current to replace human words for transmission. This is the famous Morse code. The invention of the telegraph kicked off the telecommunications era and created the history of mankind using electricity to transmit information.

History of the telephone

On March 10, 1876, Bell shouted through the walkie-talkie: "Mr. Watson, please come here! I have something to ask you!" Humanity had the first usable telephone, opening a new chapter in communication exchanges.

Think about it, talk about it

What improvements did the telephone make compared to the telegraph?

What improvements do today's phones have compared to those of the past?

Dedicated phone number

110 security hotline

119 fire alarm number

120 medical emergency number

122 traffic accident alarm number

114 Local telephone inquiry

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"Telegraph and Telephone" Information Transmission PPT Courseware:

"Telegraph and Telephone" Information Transmission PPT Courseware What is a telegraph? After three years of study by the American painter Morse, the first telegraph machine came out in 1837. Morse successfully used the on, off and long breaks of electric current to replace human words for transmission. This is Ding Ding..

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Update Time: 2024-09-30

This template belongs to science courseware Hunan Education Edition Fourth Grade Science Volume 1 industry PPT template

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Transmission of information ppt Telegraph and telephone ppt

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"Telegraph and Telephone" Information Transmission PPT Courseware 2