Nowadays, using mobile phones, tablets and other mobile terminals to access the Internet has become one of the daily leisure and entertainment methods for many people. Whether you are visiting a friend's house or in a public place, people will habitually search for Wi-Fi signals first, but you may not know that some Wi-Fi is actually charged. Mobile phone connected Wi-Fi watch received a huge bill Ms. Qi, from Xiaoshan, Zhejiang, recently entered the hospital because of her uncomfortable feeling. When she was lying on her bed and playing her husband's mobile phone, she found that China Telecom's Wi-Fi signal was strong. After entering the phone number as prompted, I received a password and there is no charge reminder. After entering the password, she began to watch the TV series online. A few days later, Ms. Yu’s husband received a text message, and this “huge bill†surprised them. After the telephone consultation, they were told that because they used more than 7 hours of Wi-Fi, they generated 6 G traffic and paid 1044 yuan. No charge when connecting Ms. Yan is very certain that she is connected to Wi-Fi when watching TV and shuts down mobile data traffic. Why do you spend so much money? Telecom customer service staff said that this price is already after the discount. The bill of fees shows that the Internet and data communication fee for November is 1954.56 yuan, the preferential amount is 954.56 yuan, and the actual amount should be paid 1,000 yuan. In addition to the monthly basic fee, voice call charges, etc., a total of 1044 yuan should be paid. This explanation made Ms. Yan very angry: "Is wireless Wi-Fi not free? To charge, I have to inform when I connect at the beginning. Why do I have to tell when I collect the money? Isn't this a deception?" The thousand dollar bill finally fell to a dozen yuan The reporter interviewed a number of telecom mobile phone users randomly. Most users have never used ChinaNet, and ChinaNet is not aware of Wi-Fi. Only one respondent said he had used it two years ago and was impressed because it was expensive. The salesperson of the telecom business hall said that the use record of Ms. Qi’s husband’s mobile phone confirmed that it used 6.3G of traffic for 7 hours. They can reduce the cost to Ms. Yan through the flow package. The charging standard is 100 yuan for 3G traffic, 6 G is 200 yuan, and 0.3G is calculated according to 20 yuan, a total of 220 yuan. Ms. Yan is not satisfied with this treatment. She insists that it should be calculated on time, because telecom time billing is cheaper. Finally, in the insistence of Ms. Yu, the telecommunications company received a fee of 12.6 yuan for Ms. Yan in accordance with the time limit of 1 minute and 3 cents. In this way, the cost of the Internet from the initial 1900 yuan, to 1,000 yuan, to 220 yuan, and finally only 12.6 yuan. How to use Telecom ChinaNet? The reporter used the telecom Apple mobile phone experience to discover that after connecting to ChinaNet's Wi-Fi, a login link will appear, and three login methods will appear: mobile account login, WiFi time card login, and broadband account login. After you select your mobile account to log in, you will receive a password and simply fill it in to connect to the network. During the entire login and use of ChinaNet, there was no reminder of how to charge for the traffic and how to charge. After the telecommunication staff prompts, the reporter opened a small "common problem" column on the login interface, only to find a question and answer about whether to charge, the answer is to charge. The staff said that with China Telecom ChinaNet, the system will first deduct the remaining package flow of personal accounts, and the excess will be charged at a rate of 3 megabytes. This is why Ms. Yu used more than 6G of traffic and will generate more than 1900 yuan. "Before there was a time-based calculation, 3 cents a minute, but now it has not been promoted. In the 4G era, we all promote the flow rate." The staff suggested that users should not use ChinaNet easily. Mobile, China Unicom also has paid Wi-Fi China Mobile staff said that mobile now has CMCC, CMCC-WEB two kinds of paid Wi-Fi, there are 5 yuan 300M, 10 yuan, 700M and other monthly activities, but if you do not cover the month, or use the two Wi-Fi beyond the package It will be calculated as 1 cent per ounce. The use of mobile cellular data is 0.29 yuan / M. China Unicom staff said that Unicom's China Unicom charging Wi-Fi has now been closed and cannot be opened. Before the related business has been opened and there is residual traffic, it can also be used. The use of Unicom cellular data is 3 megabytes. In addition, each operator's paid Wi-Fi is only available to its own mobile phone customers. For example, if a mobile user wants to use telecommunication to charge WiFi, it is not acceptable. Rectifier bridge is to seal the rectifier tube in a shell. Points full bridge and half bridge. The full bridge connects the four diodes of the connected bridge rectifier circuit together. The half bridge is half of four diode bridge rectifiers, and two half bridges can be used to form a bridge rectifier circuit. One half bridge can also be used to form a full-wave rectifier circuit with a center-tapped transformer. Select a rectifier bridge to consider. Rectifier circuit and operating voltage. 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