How to learn the basics of electricity? 15

Electricity is relatively abstract, some problems can only be imagined, and circuit diagrams.

For thinking skills.

The requirements are high, so many people fall into the pit.

First of all, you need to do a good job of pre-studying, understanding the basic concepts, such as the meaning of electricity, especially the circuit diagram to read several times.

When you are in class, you should listen carefully to the class, especially when the teacher is doing experiments, you should study seriously, and you can also ask the teacher to borrow experimental instruments to do experiments for you after class, so as to enhance your practical ability.

Do more exercises, although the tactics of the sea of questions are not advocated, but the science subjects need to be practiced more, so that they can be more flexible. Remember, it is very important to preview and summarize, after the preview, do the questions yourself, and then summarize some methods, such as what is the reason why the light bulb does not light up, you should memorize it, because you often take the test, and you also know how to measure.

Believe in yourself and don't be discouraged, it's not hard now. When you go to junior high school, you learn about electricity.

That's when it's difficult, and if you don't drive you crazy, you have to think about it and your head will bleed.

As long as you do a good job of pre-studying, it is not so difficult to summarize often, and it is better for you to be one or two lessons ahead of the teacher.

While learning theoretical knowledge, and then strengthening practical understanding. It is important to apply what you have learned in practice. You can find a power plant for an internship, or learn from a master, you will get twice the result with half the effort.

Start from the basics, carefully read the textbooks in your hand, there are many resources on the Internet, you should make full use of them!

1. Left zero and right fire.

2. The colors of the three-phase five-wire system are yellow, green, red and light blue respectively to represent the double color (PE) of the protective grounding wire.

3. During the operation of the transformer, the current of each phase of the transformer should not exceed the rated current; The maximum unbalanced current shall not exceed 25% of the rated current. After the transformer is put into operation, it should be overhauled regularly.

4. The rated voltage of the secondary coil of the voltage transformer is generally 100V.

5. The secondary side of the voltage transformer shall not be short-circuited when working. Because a large short-circuit current will be generated in the event of a short circuit, the transformer may be burned out, so fuses are installed on the primary and secondary sides of the voltage transformer for protection.

6. One end of the secondary side of the voltage transformer must be grounded. This is to prevent the primary and secondary coil insulation breakdown, the primary high voltage into the secondary side, endangering the safety of personnel and equipment.

7. The secondary side of the current transformer is close to the short-circuit condition when it is working. The rated current of the secondary coil is generally 5A.

8. The secondary side of the current transformer is never allowed to open the circuit when working.

9. One end of the secondary side of the current transformer must be grounded to prevent it.

When the insulation of the primary and secondary coils breaks down, the high voltage on the primary side enters the secondary side.

10. During installation, it must be noted that the wiring is correct and reliable, and the secondary side is not allowed to connect the fuse or switch. Even if for some reason the instrument or other device on the secondary side is to be removed, the secondary side must be shorted before it is removed.

11. Low-voltage switch refers to isolating switches, circuit breakers, fuses and so on below 1kV.

12. The load controlled by the low-voltage distribution device must be clearly divided, and it is strictly forbidden to control and confuse one gate.

13. The interlocking device of low-voltage power distribution device and self-provided generator equipment should operate reliably. It is strictly forbidden to run self-provided power generation equipment in parallel with the power grid without permission.

14. When connecting the equipment: connect the equipment first, then connect the power supply. When disassembling the device: disassemble the power supply first, and then disassemble the device. When connecting the line: connect the zero line first, then connect the live wire. When dismantling the line: dismantle the fire line first, and then dismantle the zero line.

Extended Material: Here's an introduction to how a novice electrician can start with the basics:

1. Basic knowledge of electrician, which is the basis for analyzing circuits.

2. Low-voltage electrical equipment, the key to understanding electrical equipment.

3. Electrical components and circuits, familiar with the components and circuit composition, and the cognition of electrical drawings.

4. Practical experience.