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An owner in Guangxi
Forget to unplug the charger at home when you go out
This caused a fire inside the house
00:14
Video source China Fire Protection
According to China Fire Protection, there was a noticeable fire in the owner's home shortly after leaving. Within minutes, the fire rapidly expanded to ignite a large number of combustible materials in the home, and when the property found the fire alarm, it arranged for security guards to break the door and extinguish the fire through the fire hydrant in the corridor.
Today we will study it:
Why does not pull the charger cause a fire?
How to charge my phone safely?
What aspects should I pay attention to in daily use of mobile phones?
Graph source network
The charger is on fire
Many small partners in life will keep the mobile phone charger plugged in the power supply, do not unplug it, that is, use it to rush, figure a convenience, in fact, this is a hidden danger. Zhou Hongzhi, associate professor of the School of Applied Mathematics and Physics of Beijing University of Technology, said:
The mobile phone charger will reduce the voltage of 220V to about 5V when it is working, which requires that it must have sufficient voltage resistance and insulation, but over time and the increase in the number of uses, the material on the charger will continue to age.
Lei Yi'an, associate professor at the School of Physics of Peking University, explained that if the charger is placed on the plug board for a long time, it will continue to heat up, thereby accelerating the aging of devices and materials, which is easy to produce short circuits or high-voltage breakdowns, which will cause fire hazards.
Wang Bangping, senior physics teacher at the Affiliated Middle School of Capital Normal University, introduced: For some mobile phone chargers with a low degree of intelligence or substandard quality, the charging time is too long may overheat the mobile phone, which will cause the mobile phone to burn or explode. At the same time, the charging time is too long may also increase the possibility of short circuit at the charger output. Once the charger output is short-circuited, the current at the input increases sharply, causing the charger to burn or explode.
Pay attention to mobile phone charging
1. Pay attention to the charging sequence
When charging, you must first plug the plug into the socket, and then plug the data cable into the mobile phone, if the order is reversed, it may produce a large surge in an instant, which will cause damage to the mobile phone for a long time.
A surge, also known as a surge, is a transient, violent pulse that occurs in just a few millionths of a second beyond the normal operating voltage. When you start charging your phone, sticking your ear to your phone may hear some subtle buzzing noises, which are caused by surges.
Charging your phone according to the right steps, although it is not possible to completely eliminate the surge, it is possible to avoid the direct impact of excessive surge on the phone to a large extent. Of course, if you are using an anti-surge plug and an original charger, it does not matter which end is plugged in first when charging.
After charging, the mobile phone is also unplugged first, because when the charger is unplugged, it is easy to generate reverse instantaneous current, which may lead to a series of problems such as accelerated aging of the battery and shortened battery life.
It should also be noted that some small partners will directly drag the charger cable when unplugging the charger, which is easy to cause damage to the charging equipment, and when plugging and unplugging the charger, you should use two hands, one hand pressing the plug board, and the other hand plugging in the charger.
2, try not to charge in a very cold or hot environment
When the weather is hot, to avoid charging in the sun, if the living environment is often in a high temperature state, it is recommended to configure some high-performance, high-temperature resistant switching transformer charging heads. Do not charge in a low temperature environment, because the low temperature protection mechanism of lithium batteries will promote the chemical reaction of substances in the battery, resulting in the inability to charge or slow down the charging speed.
3. Do not charge at the head of the bed
Many small partners will habitually put the charger on the bedside, which is very convenient, but if there is a danger, the bed will easily be ignited, which will cause a bigger fire.
4. Do not use damaged charging equipment
The charging cable is too long to be damaged, and the metal wire inside should not be used again if it is exposed, otherwise it is easy to leak in the process of charging, so the charging cable must be replaced in time when it is damaged.
5. Do not use your mobile phone when charging
If you play with the mobile phone while charging, there will be a buck system in the phone to automatically reduce the voltage, but this buck system will consume power, and the power consumed will be released in a heat situation, and these heat will be superimposed with the heat generated by the normal use of the phone, and the phone will be hotter than usual. If it is running a large program, the heat dissipation is not sufficient, the high temperature caused by it will shorten the life of the lithium battery, and this loss is irreversible.
When the battery life drops to a certain extent, the chance of accidents increases. During charging, it is possible to break through the diaphragm in the battery cell, short circuit the battery cell, causing high temperature and high pressure and explosion or electric shock.
Precautions for mobile phone use
1. Shorten the use time of mobile phones
Don't stare at your phone for a long time, every hour, you should get up and move your body, rub your eyes, and look into the distance.
2. Adjust the posture
Many small partners like to lie on their sides to play mobile phones, in fact, the pressure on the eyes is the largest, which will cause deviations in the vision of the left and right eyes. Moreover, the pressure of the pillow on the eyes will cause insufficient blood supply, and it is easy to overlap short-term images over time. Do not maintain a position for a long time when using the mobile phone, every 20-30 minutes, you should change the posture, you can lie on your side and look up back and forth.
3, do not turn off the lights to play mobile phone
Under normal circumstances, people's pupils should be narrowed when looking at things at close range, but in a dark environment, people's pupils will be dilated, so playing with mobile phones in the dark is contrary to the physiological requirements of the eyes, which will accelerate eye fatigue.
In addition, playing with mobile phones in a dark environment for a long time, the pupils will dilate, the intraocular pressure may be elevated, and long-term high intraocular pressure will cause mechanical compression damage to the optic nerve.
Especially people with high risk factors for glaucoma, because of its poor flow of aqueous humor, causing obstruction, causing a sharp increase in intraocular pressure, which induces acute angle-closure glaucoma, damage to the optic nerve, vision, and seriously leads to blindness, so try to use mobile phones in a bright environment.