1. Website and telephone number of the vocational skill appraisal and guidance center of the Ministry of human resources and social security of the people's Republic of China
2. Power electricity is composed of four wires. In the connection of high-voltage wires, the voltage of the transformer is changed from fair to 380V, which is limited by the power of the transformer at home. Only the calculated value is increased by 15%. Its output line is composed of four wires, three live wires and one zero wire. The home appliance has a zero wire, while the power appliance does not have only three live wires, which is related to the appliance it adapts to,
3. Power electricity, commonly known as three-phase electricity, is relative to single-phase electricity, which is mainly invented to save transmission lines. Technically speaking, the key point of three-phase electricity is that the three phases of three-phase electricity have a phase difference of 120 degrees. A group of single-phase electricity can not be divided into standard three-phase electricity in a simple way. Both capacitance and inctance can only shift phase by 90 degrees, which can not meet the requirement of 120 degrees.
4. Power electricity is three-phase electricity. The four wires are red, red, red and blue. The three red wires are live wires with a voltage of 380V. The voltage of any red wire (live wire) and one blue wire (zero wire) is 220V. There are star and triangle connection methods for three-phase power supply (or transformer) and load
There are many uses of three-phase AC, most of the AC electrical equipment in instry, such as motors, use three-phase AC. In daily life, single-phase power supply is often used
when lighting power supply is adopted, one phase of three-phase electricity is used to supply power to electrical equipment, such as household appliances, while the other line is the fourth line among three-phase four wires, that is, the zero line, which is led out from the neutral point of three-phase electricity
extended data:
three equal size, the same frequency, the initial phase difference of 120 ° A three-phase alternating current is formed by combining two alternating currents. The actual three-phase alternating current is generated by a three-phase generator, in which there are three identical windings with a space difference of 120 ° Uniform distribution
When the generator rotates, three single-phase alternating current can be generated °， There is a time difference in the current flowing through each wire
in this way, there is no need for six wires to supply power, but only three windings are connected in a certain way in the generator, and three or four wires are used to supply power. One alternating current from each winding of the generator is called one of the three-phase alternating current
5. The University of Westminster has four campuses, close to each other. Three of the campuses (Cavendish, Marylebone and Regent) are located in the west end of London, adjacent to central London and major business districts, financial district, business district, government seat, fashion and cultural district. Another campus of the University of Westminster is in harrow, a 20 minute subway ride to the city center. Compared with other campuses, the pace of life here is quiet and peaceful, but it is not too far from the city center.
6. The city center is at Westminster Cathedral, near Buckingham Palace
7. London is the second largest international financial center in the world, with many financial streets
8. Yes, Westminster is made up of four central London homes, three of which are located in the west end and are very close to each other. The school is headquartered on Regent Street and the other three are in Fitzrovia, Marylebone and harrow in London.
9. If your account has not been bound
you will enter the binding page when you log in to the player cloud app. You can start scanning on this page and scan the QR code on the back of the device to bind.
