Analysis and analysis of electrician problems, electrician problems, solving

It's definitely not normal, your socket switch should control the live wire L, and the neutral wire should be soldered directly to the socket N. Look at your first case, it must be the switch controlling the neutral line. When the switch is closed, the use is normal, a little switch is disconnected (the neutral line is disconnected,), and the 220V voltage is returned to the zero hole of the socket through the electrical appliance, causing both jacks to have electricity.

Although such wiring can be used normally, it is not standardized and unsafe.

The first situation is that the live wire and the neutral wire are connected to the electrical appliance, which has a high impedance on it, but the neutral wire is connected to the switch, and the switch is not closed, so the neutral wire is not connected with the neutral line of the system, and is in a suspended state, so it is basically equipotential with the live wire. However, when the switch is closed, it is connected to the neutral line of the system, and the potential becomes the neutral potential.

I want to connect the live wire and the switch together, so that it is safer. This is especially true for electrical appliances that do not have a grounding wire.

According to the problem description, this plug-in board is tested without electrical equipment, which excludes the possibility of equipment live wire return, regardless of whether the plug-in board comes with a switch to cut off the live wire or the zero line, both holes show that the power is abnormal, the main reason should be the insulation degradation of the partition between the zero live wire inside the plug-in board. It is recommended to replace it, if the use time is extended again, when it is not used with electricity, accidentally touching this plug-in board, it will bring a safety threat to life.

It is not normal, this situation occurs because the switch is mistakenly connected to the zero line, and the switch should control the live wire, which is prone to the risk of electric shock. When the switch is disconnected, it is normal that the live wire and neutral wire of the socket are not lit.

Voltage: The voltage transfer in the primary and secondary windings of the transformer is carried out according to the ratio of turns, so.

uo = ui * 110 / 550 = ui / 5 = 220 / 5 = 44v

Power: The power of the primary and secondary windings of the transformer should be equal, so.

Wi = wo = square of UO RL = 44 * 44 11 = 176W

The formula for calculating the power of the original winding can be written as wi = ui * ii, which can be obtained by reverse calculation.

ii = wi ui = 170 220 = then the equivalent impedance of the original winding.

ri = ui / ii = 220 / = 275ω

What electrician problems, directly describe clearly, enthusiastic to know that netizens will help you answer questions.

Internal resistance 2.

The active network is equivalent to an ideal voltage source E with series internal resistance r. From the meaning of the title, it can be seen that e=8 . According to KVL:

Every household is inseparable from electricity, and every minute and second is indispensable all year round. Cold weather is inseparable from electricity, hot weather is inseparable from electricity, and eating is inseparable from electricity, which is indispensable for every household.

There was a power outage, and now it was troublesome, and I didn't know if it was broken, or if it was really a power outage, so I had to pick it up and call the electrician, you hurry up and come to my house to see if the electricity is broken.

Electrician is a good technology, everyone needs, is a technology that many people are optimistic about, not only do things at home, but also many factories, companies, enterprises, hotels and hotels need electricians. It is true that electricians are a very hot industry, and they are also relatively easy skills.

Now the development of the electrical industry is relatively good, you can walk around the market and give yourself a reference and decision. You can also look at some well-developed cities. Good for you! I wish you success in your career!!

The electrical industry covers the manufacturing industry from power generation equipment, power transmission and distribution equipment, to a variety of electrical equipment (strong electricity), as well as basic components and basic materials for electrical engineering.

Include. Large Motors, Steam Turbines, Micro Motors, Electric Welding Machines, Transformers, Power Station Boilers, Power Electronics, Electrical Ceramics, Wires and Cables, Industrial Boilers, Heat Shrinkable Materials, Traction Electrical, Power Tools, High Voltage Switches, Welding Materials, Electric Carbon Products, Hydropower Equipment, Power Station Auxiliaries, Explosion-proof Electrical Appliances, Electrical Alloys, Insulating Materials, Lead-acid Batteries, Fractional Horsepower Motors, Power Capacitors, Small and Medium-sized Motors, Electronic Control and Distribution Equipment.

Industrial Household Appliances Internal Combustion Power Generation Equipment Insulator Arresters General Low-voltage Electrical Appliances Electric Furnaces and Industrial Furnaces Electrical Special Equipment.

Comprehensive unit enterprise, standardization committee, electrical equipment, mechanical structure, electrical accessories and household controllers, relay protection and automation equipment and other industries.

With the continuous growth of the electrical market capacity, the development trend of the electrical industry has been sharp, and many enterprises have taken advantage of this trend to pour into the electrical industry. In the huge lineup of electrical enterprises, NVC Electric work for the latecomer in the electrical industry, based on the fierce market competition, and according to the tenacious growth, lasted seven years, NVC Electrician has grown from the initial "not deeply involved in the world" to a "mature and steady" enterprise, a number of indicators in the forefront of the industry, especially in 2009 NVC Electric Wanzhou base officially put into operation, NVC Electric has achieved another leap.

Electricians are a basic trade, and it's good.

The electrician certificate is divided into:

1. The electrician's network access operation license (installation and maintenance, which is divided into high-voltage, low-voltage and special) is the original power supply bureau of the Electricity Regulatory Commission.

2. The electrician's special operation certificate (mainly learning safety and basic knowledge of electricians is divided into primary, intermediate and advanced) is the original labor bureau of the safety supervision bureau.

3. The electrician technical grade certificate is the equivalent of the electrician's title of the Personnel Bureau.

Maintenance electricians: internal line, external line, high voltage, low voltage and so on. Electricians can work in factories, institutions, schools, rural areas, and other places where there is electricity.

Learn low-voltage maintenance electricians have to later appliances or appliances. Air conditioning maintenance helps. To learn electrician, you must first learn the basics of electricians, fitters and other knowledge, which is also the basic skill of home appliance maintenance.

There are two departments issued the electrician certificate, one is the Safety Supervision Bureau, which is called the operation certificate. One is the Labor Bureau, which is called the Grade Certificate.

The business scope of the electrical operation certificate of the Work Safety Supervision Bureau: electrician operation certificate (installation, maintenance, duty, power generation, power distribution, substation operation, explosion-proof electrical appliances, underground mine electrical fitters, experimental workers), low-voltage electrician operation certificate, high-voltage electrician operation certificate.

Electricians are divided into high and low voltage electricians, and weak electricians, all of which can be maintenance electricians, but the places are different. High-voltage electrical equipment, such as our common high-voltage cabinets, and various large machinery in mines. What is done at low voltage is generally to change the bulb, change the contactor or something.

Now the certificate is called special industry installation and maintenance. The network cables we use, the audio, and various integrated modules belong to the weak current electrician. If you want to learn to repair air conditioners, it will be different from these, and I personally think that the work on the circuit board is the most rare among electricians.

A maintenance electrician is not the same as a home appliance repairman! The operation certificate is universal, only divided into high pressure and low pressure