"Feeling Information" Entering the Information Age PPT Courseware 3

Description

"Feeling Information" Entering the Information Age PPT Courseware 3

New knowledge exploration

1. Information: refers to information that is useful to people.

Weather forecasts are information about weather changes, and commercial advertisements are information about product sales. There is a lot of information, and it exists in every aspect of our production and life. For example: economic information, cultural information, military information, sports information, scientific and technological information, etc.

Modern society has entered the information age, and information has become an important part of people's work, study and life.

2. The recording and dissemination of information cannot be separated from the "carrier". Ancient bamboo slips, modern paper printed materials such as books and newspapers, electronic publications such as magnetic disks and optical discs, and communication methods such as television, radio, telegraph, telephone, and the Internet are all "carriers" for information dissemination.

1. Recording and storage of information

The brain is a natural store of information

The creation of words revolutionized human information recording

The invention of paper and printing revolutionized the recording and dissemination of human information.

2. Ancient information dissemination

beacon fire homing pigeon stagecoach

trumpet semaphore long distance running

kite lighthouse drumming

3. Dissemination of modern information

In 1837, Morse invented a practical telegraph machine, which made it possible to send messages between two places at the same time. Early telegraphs were completely manually operated and mainly transmitted text messages. After continuous improvement, mechanical telegraphs were developed, and now they have developed into electronic telegraphs with higher automation procedures, and there are also telegraphs that can automatically translate telegraph codes into Chinese characters. Chinese telegraph decoder. The use of telegraph to transmit information has the characteristics of economy, speed, confidentiality and convenience.

microphone

1. Microphone structure: There is a metal box in the microphone, which is filled with carbon particles and covered with a diaphragm.

2. Microphone characteristics: The contact between the carbon particles is not close, and the overall resistance changes with the tightness of the diaphragm.

3. The function of the microphone: convert vibration into electric current that changes in intensity.

principle

When speaking, the vocal cords vibrate and produce sound → causing the air in the medium to vibrate and transmit sound → the air vibrates and causes the carbon particles in the carbon disk in the microphone to loosen and tighten → causing the resistance in the circuit to suddenly become large and small → causing the current in the circuit to suddenly become large and small Small→This causes vibration within the diaphragm and produces sound.

Sound causes the medium air to vibrate and spread → the air vibration causes the eardrum to vibrate → the speaker’s voice is heard.

Practice in class

1. Which of the following methods has the largest capacity for storing information?

2. Which of the following methods saves information the longest?

3. Which of the following methods is the most convenient for reading information after saving it?

4. Which method is the cheapest to save the same amount of information?

5. Which method saves the most types of information?

A Bamboo slips B Paper C Audio tape D Video tape E Disk and CD

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For more information about the PPT courseware "Entering the Information Age and Feeling the Information", please click the "Entering the Information Age PPT and Feeling the Information" PPT tag.

"Feeling Information" Entering the Information Age PPT Courseware 2:

"Feeling Information" Entering the Information Age PPT Courseware 2 Know what information is. Understand the ancient way of transmitting information. Know how to record and save information. Know the modern information transmission: telephone and telegraph. Information. Information refers to news that is useful to people. Weather forecast is about the weather...

"Feeling Information" Entering the Information Age PPT courseware:

"Feeling Information" Entering the Information Age PPT courseware 1. Early information dissemination methods and characteristics 1. Dissemination methods: In an era when transportation and communication were very underdeveloped, people often used ________, ________, ________ and other methods to transmit information. 2.Features: propagation speed..

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Update Time: 2024-11-11

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

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