| Category | Format | Size |
|---|---|---|
| Lu Jiao Edition Ninth Grade Physics Volume 2 | pptx | 6 MB |
"Telephone" Electromagnetic Wave PPT Courseware 3
Description
"Telephone" Electromagnetic Wave PPT Courseware 3
Changes in information transmission
beacon relay
Posting books at the inn
Telegraph and fax
landline phone
semaphore communication
cordless phone
Telecommunication
The basic structure and working principle of the telephone
The boy talks, the microphone diaphragm vibrates, the carbon box resistance changes, the loop current changes, the magnetic strength changes, the earpiece diaphragm vibrates, the girl hears the sound
Think about it and draw a picture
(1) How many phone lines are needed?
(2) How can we reduce the number of telephone lines?
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For more information about the "Electromagnetic Wave Telephone" PPT courseware, please click the "Electromagnetic Wave ppt Telephone ppt" tab.
30 PPT materials of white three-dimensional little people holding phones and making calls:
These are 30 PPT materials of white three-dimensional little people holding a phone and making calls. .PPTX format;..
"Telegraph and Telephone" Information Transmission PPT Courseware 2:
"Telegraph and Telephone" Information Transmission PPT Courseware 2 How to 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 replaced human civilization with the on, off and long interruption of electric current.
"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: 2024-06-30
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