mu Welcome to the unitPPT学习课件PPT课件

1、To look at the four different electrical and electronic devices (P1) and discuss how these devices have changed our lives第1页/共17页Many things have been invented in the history of mankind and more and more things are to be invented. Technology has seen some developments in the last few decades.What el

2、ectrical and electronic appliances (电器) do you have at home?第2页/共17页Which do you think is the most useful?第3页/共17页Electronics have developed very quickly in the last decades. Do you think these things have made our lives more convenient or have they made simple things more complicated?第4页/共17页Whats

3、your opinion on these products? 第5页/共17页 They are invented to meet peoples needs. They have improved peoples lives to some degree. They are developing very quickly. The radiation from some of the electrical or electronic devices, such as mobile phones, may be harmful to peoples health. When people b

4、uy new electrical or electronic devices, they throw away the old ones. This may generate a large amount of waste, which is harmful to the environment. 第6页/共17页Picture 1: Compare the TV in the picture with the TV in your home.1. antennae (天线) on top 2. a small screen 3. only black and white pictures

5、4. no remote control 第7页/共17页Development of TVblack-and-white TVcolour TVLCD screen液晶显示器第8页/共17页Picture 2: How did people record music in the past?Put the tapes into the recorder in the past.People need to record music now:A computer, an MP3 player, a mobile phone and some recording software.第9页/共17

6、页gramophone (留声机)radio/tape recorderMP3 playerCD playerDevelopment of audio (音响) devices第10页/共17页Picture 3: How do you look up a word in a paper dictionary?We key in the word we want to look up and click the button Enter. Then the word entry will appear on the screen.How do you look up a word in an

7、electronic dictionary?第11页/共17页Development of dictionariespaper dictionaryelectronic dictionary第12页/共17页Picture 4: How did people keep in touch in the past?- by letter/telegraph/telephoneHow do people keep in touch now?- mostly by mobile phone第13页/共17页Development of communicationletter/telegramtelephonecell phone第14页/共17页Developmentof camerasmobile phonewith a cameradigital cameratraditional camera第15页/共17页 Microwave ovens Refrigerators TV sets Air conditioners Washing machines Vacuum clean