Question 10 on electrical appliances

Hello! 1. Coal mine substation technology and business.

2. Knowledge and technology related to the four major parts of mine electromechanical (ventilation, drainage, pneumatic pressure, lifting and transportation).

3. Drawing, processing, off-line and three-way switching of electric motors in mines and well electromechanical power plants.

4. Relevant knowledge and necessary management ability of mine mechanical and electrical work manual.

5. Miners' living habits, language, and personality characteristics.

It would be helpful to read more magazines.

FYI. Ask.

I recommend you to learn these basic books, such as the four major textbooks that need to be read...

1. In the mine, there is no separation of electromechanicals. But you're studying electricity, so think about the electrical side of things. Such as the equipment and operation of substations. There is also the power of the motor, which is used on those equipment.

2. Four major pieces, about the press fan, about the water pump, about the winch, about the blower, look at the corresponding book.

AC 220 direct charging 12 payments. The first thing to look at is how many amps the battery has. If it's a dozen to twenty amps. Step-down charging with capacitors in series can be considered. Capacitor step-down is better than resistor. I have drawings if needed.

Find your local sewing machine dealer that has exactly what you want.

The old version of Nokia, the kind with a blue screen, is not a problem to stand by for a month.

Take a look at JD.com**.

Philips mobile phones have a long standby time, more than a month.

How to take care of household appliances A: The maintenance of household appliances should be regular, and in general, should be checked once a year to ensure the proper functioning of the appliances. The contents of the inspection include checking the power cord, checking the connector, checking the switch, checking the socket and checking the cleanliness of the internal parts of the electrical appliance.

In addition, to ensure the safe use of electrical appliances, it should be ensured that the electrical appliances are in a dry environment, and the empty ones should be used in a humid environment.

It depends on what kind of electrical appliances it is, such as microwave ovens, induction cookers, DVD players, etc., and the power should be cut off after use.

Other electrical appliances such as air conditioners, televisions, computers, etc., if the power supply is turned off by the remote control, but the power supply part still has electricity, although the power consumption is very small, generally within 10 watts, there is no problem in a short time, but the electrical appliances should be cut off for a long time, which must reduce power consumption, and the second is to avoid damage to circuit components.

If it is too troublesome to discriminate the power plug frequently, it is easy to cause the phenomenon of poor contact between the plug and socket, it is best to replace the power socket with a 16A switch, so that when the electrical appliances are not in use, the switch can be turned off directly.

These depend on what electrical appliances are: it is best for TVs not to pull out, because now TVs are liquid crystals, and the liquid crystal displays on the market now use TFT LCD panels, which are the most advanced liquid crystal display technology at present, from the structural point of view, the LCD screen is composed of two linear polarizers and a layer of liquid crystal. If the power is cut off frequently, it will affect the service life of the LCD monitor.

Microwave ovens are better off the power.

Switch on and off frequently. In winter, the temperature of the general room is about 0-20, and the working temperature of household appliances is relatively high.

Try to reduce the temperature difference of the low-cost use environment in the world. The temperature difference of the use environment is too large, which will cause a large amount of water vapor to be produced in the use of household appliances, and over time will accelerate the rust and round limb corrosion of components, which can easily lead to damage to household cavity appliances.

Do not go near heat sources. In winter, the number of household heaters increases, if the household appliances are close to the heat source, the household appliances are disguised to "face the stove and turn their backs to the cold", so that the whole machine works at two temperatures, which will lead to current and voltage imbalance, and eventually damage the household appliances.

It should be placed in a leeward place. If household appliances are placed in a windward place, they will inevitably be affected by the cold wind, which will accelerate the aging of household appliances components and shorten their service life.

It is not advisable to "hibernate". It mainly refers to refrigerators, freezers and other electrical appliances. Many families often use natural low temperature preservation food in winter and stop using the above-mentioned household appliances, which may cause the refrigerant to solidify after they are stopped, resulting in poor flow paths, and eventually making the household appliances "sleep for a long time".

It is not appropriate, whether it is a traditional transformer or a switching power supply, they have to consume electricity, and all life spans are limited, so it is best to completely cut off the power

When the electrical appliance is not in use, the power switch on the electrical appliance should be turned off, or the plug should be unplugged, such as microwave ovens, induction cookers, DVD players, etc., the liquid air power plug should be unplugged, or the power socket should be replaced with a switch.

It's best to turn off the power and unplug when not in use. This is for the safety of Bi Wai Late. At the same time, the product will consume power supply when it is in standby, which will have an impact on the life of internal components.

The first is the aging of the line: all electrical appliances use wires, and the wires have a certain service life, when the line reaches or exceeds the service life, the line will naturally age. The specific performance is the increase of resistance, the flammability of the line, etc.

Moreover, according to the different quality of the lines used by the manufacturer during production, the aging time of the line is also uncertain, but it is basically subject to the service life of the electrical appliances. There are no more than two measures to avoid the aging of the line: one is to replace the new line in time after reaching a certain service life for some lines that can be updated; Second, for some lines that cannot be updated separately, when the machine reaches the service life, it will be scrapped in time.

As for the fire caused by household appliances, there are basically two main reasons: one is the fire caused by the spontaneous combustion of electrical appliances caused by the aging of electrical wiring, and the other is the fire caused by the leakage of electrical appliances or lines, of course, it may also be caused by internal short circuit due to electrical quality problems. The best measure to avoid fires caused by household appliances is to cut off the power supply when the appliances are not in use; Preventive measures also include timely maintenance of household appliances, regular early warning inspections of the electricity environment (for example, the use of electric water heaters with safety warning functions produced by Haier can issue early warnings for household leakage in a timely manner), and timely scrapping of electrical appliances that have exceeded the service life.

Common faults in electrical contacts include burns and singeing, which cause poor contact faults, due to inappropriate contact spring pressure adjustment.

The failure of electrical products mainly has the following aspects:

1. Internal circuit short circuit. The main reason is that the internal assembly quality is unqualified, and the conductive material is placed on the solder joints or between the pins of the components, resulting in a short circuit; There is also the case of a short circuit inside the electronic component due to mass or high voltage (breakdown voltage). Such as sudden increase in line voltage, lightning strike, static electricity, dust, etc., this kind of fault is highly destructive and has large losses, which is likely to cause accidents such as scrapping of electrical appliances or fires.

2. Open the road. The main reason is that the process quality is not good, which leads to the opening of the solder joint. If the solder joint is soldered, the solder joint is not full, the design problem leads to the large stress of the component, the resistance and other components are broken, and the fault performance is the sudden failure of the electrical appliance, or the whole machine has no electricity, such faults generally do not cause large losses, and it is relatively easy to repair.

3. Component failure. This is mainly due to the loss of component functionality due to component quality or design issues. The fault manifests itself as an appliance that is not working properly or is not working at all. Such faults are difficult to repair and require principle analysis and measurement of the entire circuit.

4. Drift of working parameters. The main reason is that due to the aging of long-term use of components, the working parameters of the circuit change, resulting in abnormal operation of electrical appliances. Such failures can generally be resolved by adjustments.

Pure handwriting, not pasting, I hope to return to satisfaction.

Poor contact, impassable roads, dust barrier or oxidation.