learn welding, welder training school , how to choose a welder certificate? The cost of coming to Luoyang Jili Welder Training School is low: 3800 for January to study at the Pipeline Argon and Electricity Association (6/7000 for other schools). High skills: After learning advanced piping, automatic pipe welding and graduation, I will be assigned to work as a welding training teacher in another school. (None of them have seen it) No money: (Study first and pay tuition after graduation) Earn money slowly: Free overseas placement, monthly salary starts at 20,000. Take the welder certificate test once every 22 weeks, and the certificate will be issued quickly without any delay!
Luoyang If you want to learn electrician now, it is absolutely right to go to Jili Welding School. The school is a very famous electrician technology training school in Luoyang area. The school has a variety of power facilities and equipment for every student. Use it in study. I think the most important thing when learning electrician is to apply what you learn. If you only focus on theoretical knowledge during the study period, it is easy to lose enthusiasm for learning. It is more through various types of equipment. The practical application of theoretical knowledge is carried out in the classroom. The school is equipped with both low-voltage and high-voltage electrician equipment. It is the most well-equipped school in Luoyang.
On average, the school opens classes on a rolling basis at the beginning and middle of each month. There are several electrician training classes in the school that are taught in rotation. This means that you can basically encounter new classes when you come, and you can follow them directly. If Don’t be discouraged if you don’t encounter a new class when you arrive at school. During the learning process, the school teachers will make a separate study for you to keep up with the previous learning courses.
Electricians refer to workers who are engaged in installing, maintaining, operating or repairing electrical equipment. Basic knowledge is very important. Although the questions in the later examinations are different, they all come from the basics. Knowledge. Only by laying a solid foundation can you get twice the result with half the effort when learning. The same is true for electrical engineering knowledge. Today I will share some basic knowledge necessary for electricians. Friends who need it can save it for later use. Basic knowledge must not only be memorized, but also understood. You must be able to learn and apply it, and learn to combine theory with practice.
1. Common part
1. What is a circuit?
The path that the current takes is called a circuit. The circuit is generally composed of load and connection parts (wires, switches, fuses ), etc.
2, what is the basic concept of electric current?
The electric charge flows in a regular direction to form a current. It is customary to stipulate that the direction in which the positive charge of moves is the actual direction of the current. The circuit whose current direction remains unchanged is called DC circuit .
The amount of electricity passing through any cross-section of a conductor per unit time is called current (intensity), which is represented by the symbol i.
The unit of current (intensity) is ampere (a). Large current units are commonly expressed in kiloamps (ka), and small current units are commonly expressed in milliamperes (ma) and microamps (μa).
1ka=1000a
1a=1000 ma
1 ma=1000μa
3, what is power supply?
power supply is a device that converts non-electrical energy into electrical energy.
4, What are the basic properties of voltage?
1) The voltage between two points has a unique value.
2) The voltage between two points is only related to the positions of these two points, and has nothing to do with the path of the charge movement.
3) Voltage can be divided into positive and negative, which is related to the reference voltage direction of the mark.
4) Walking around any closed loop in the circuit, the sum of the voltages at each section is always zero.
The unit of voltage is volt (v). According to different needs, kilovolts (kv), millivolts (mv) and microvolts (μv) are also used.
1kv=1000v
1v=1000 mv
1mv=1000μv
5, what is load?
load is a device that consumes electrical energy, that is, electrical equipment.
The connecting part is used to connect the power supply and the load, forming the intermediate link of the current path, and is used to transport, distribute and control electric energy.
6, What are the three elements of AC ?
maximum value, period (or frequency), initial phase.
7, What is Ohm's law for and for partial circuits?
The current flowing through a circuit is directly proportional to the voltage across the circuit and inversely proportional to the resistance of the circuit. This relationship is called Ohm's law. Expressed as: i=u/r
where: i——current (a); u——voltage (v); r——resistance (ω).
Ohm's law of some circuits reflects the relationship between voltage, current and resistance in some circuits. It is the main basis for analyzing and calculating some circuits.
8, what is the significance of improving the power factor of and ?
improves the utilization of power supply equipment.
improves power transmission efficiency.
improves voltage quality.
9, what is the concept of resistance?
The ability of a conductor to hinder current is called resistance, represented by the symbol r. When the voltage is 1 volt and the current is 1 amp, the resistance of the conductor is 1 ohm (ω), and the commonly used unit is kiloohms (kω). Megaohm (mω).
1mω=1000kω
1kω=1000ω
What issues should electricians pay attention to?
1. What is electricity, current, voltage, resistance, circuit, and electrical power? Electricity---The amount of charge carried by an object is called electricity, and the unit is coulomb . Electric current---the directional movement of charges in a conductor forms an electric current. The unit is called ampere , or ampere for short. The electricity passing through the cross-sectional area of the conductor in 1 second is 1 Coulomb, and its current intensity is 1 A...
2. What is a safe voltage? When the human body comes into contact with electricity, the voltage that will not cause any damage to various tissues of the human body is Safe voltage.
3. What are the dangers of unbalanced electricity consumption in three-phase ? Due to the unbalanced three-phase voltage, a reverse rotating magnetic field will be generated on the stator of induction motor . At this time, the induction motor runs under the action of two forward and reverse magnetic fields, so The forward-sequence rotating magnetic field is much larger than the reverse-sequence magnetic field, so the rotation direction of the motor is in the forward-sequence direction, but the reverse-sequence resistance of the rotor is very small, so the reverse sequence...
4. What are the three electrics? The three electrics refer to planned electricity consumption and conservation. Use electricity and use electricity safely.
What certificates do electricians need?
1, Vocational Qualification Certificate : Vocational Qualification Certificate The Vocational Skills Appraisal Center of the Labor and Social Security Department conducts an objective, fair, scientific and standardized evaluation and appraisal of the skill level or professional qualifications of electricians, and issues the corresponding National Vocational Qualification Certificate to qualified candidates. , divided into five levels: junior, intermediate, senior, technician, and senior technician. They are universal across the country and do not require annual review.
2, special operation certificate : The state stipulates that special operation operators must hold a certificate to work. The function of the electrician special operation certificate is equivalent to the employment certificate . It mainly proves that the holder has the knowledge of safe electrician operation. and ability. The Electrical Special Work Operation Certificate is issued by the State Administration of Work Safety and is valid for 3 years and must be reviewed after expiration.
3. Network access work permit: Electrician's network access work permit is a license certificate for engaging in electrical installation, testing, maintenance, operation and other operations on the user's power receiving device or power transmission device. Grid access operations are carried out within the scope of operations determined by the grid access operation license, which is divided into three categories: low voltage, high voltage and special. It is issued by National Energy Administration and is valid for 3 years. After expiration, it must be reviewed
