Why is it called “electrical” instead of “electrical”?
Industry knowledge
As a major in electrical engineering, do you encounter such problems? When relatives, friends and even neighbors around you ask you what major you are studying at school, and you answer electrical majors, most of them understand it as electrical appliances, and they want to repair electrical appliances. , and then they asked you can repair home appliances? Don’t know if you have had such an experience. The key is that they understand electricity as electrical appliances, and the meanings of the two words are completely different. At the junior college level in our country, there is a major called electrical automation technology, there is a major called electrical engineering and automation for undergraduates, and there is a major called electrical engineering for graduate students. These majors can be referred to as electrical majors. So let’s talk about the difference between the two words electrical and electrical? What do they mean? From the perspective of subject division, electricity, electronics and electrical appliances all belong to the discipline of electrical engineering. The word “electrical engineering” comes from Japan, and the “qi” in it comes from the translation of Western foreign languages (at the beginning of Western industry, power machinery was driven by steam turbines, which were later used to generate electricity, so \\\\’Electrical\\\\’ began Generally refers to industrial power, and now electrical refers to electricity), electrical engineering is also electrical engineering. 1. Electricity: Electronics, electrical appliances and electricity all belong to electrical engineering. It is an abstract concept that does not specifically refer to a certain device or device, but refers to the entire system and the category of electronics, electrical appliances and electricity. 2. Electric power: Electric power is the strong electric part of electrical engineering. It mainly studies the supply of electric energy (that is, the generation of electric energy – power generation system), transmission (power line transmission), transformation (high and low voltage transformation, transformers, circuit breakers, contactors) ;Electric power is divided into high-voltage power, voltage transformation and distribution; 3. Electronics: Electronics refers to the weak current part of electrical engineering, mainly researching information processing and transformation; electronics can be divided into two parts: electronic circuits and electronic systems. Electronic circuits (electronic components: electronic components for making circuit boards and electronic designs, such as diodes, triodes, silicon, LED lights. Electronic devices: an electronic functional device composed of single and multiple circuit boards). Electronic system: The system composed of electronic equipment is the weak current engineering system. 4. Electrical appliances: electrical appliances are specific equipment, and electrical appliances in a narrow sense refer to switches in the industrial field. In the civilian field, electrical appliances refer to power-consuming electrical equipment (that is, electrical equipment such as washing machines, televisions, and refrigerators). Academic definition: all electrical equipment that automatically or manually turns on or off the circuit according to specific external signals and requirements, continues or continuously changes the circuit parameters, and realizes the switching, control, protection, detection and adjustment of the circuit is called for electrical appliances. Electrical appliances generally refer to all appliances that use electricity, such as: televisions, refrigerators, fans, computers, etc. From a professional point of view, they mainly refer to connecting and breaking circuits, and changing circuit parameters to achieve Electrical devices, equipment and components for the control, regulation, switching, detection and protection of circuits or electrical equipment.
Classified by working principle
1) Electromagnetic electrical appliances work according to the principle of electromagnetic induction, such as contactors, various types of electromagnetic relays, etc. 2) Non-power controlled electrical appliances are electrical appliances that rely on external force or changes in some non-electrical physical quantities, such as knife switches, travel switches, buttons, speed relays, temperature relays, etc.
Classified by action principle
1) Manual electrical appliances are electrical appliances that are operated by hand or by mechanical force, such as manual switches, control buttons, travel switches and other master electrical appliances. 2) Automatic electrical appliances are electrical appliances that operate automatically by means of electromagnetic force or changes in a certain physical quantity, such as contactors, various types of relays, solenoid valves, etc. Electricity is a science that creates, maintains and improves the limited space and environment by means of electric energy, electrical equipment and electrical technology, covering three aspects of electric energy conversion, utilization and research, including basic theory, applied technology, facilities and equipment, etc. For example: grounding resistance tester for building electrical testing instruments, low-voltage megohmmeter, low-voltage electrical comprehensive tester, etc. Why is it called “electrical”, mainly refers to the two ways of electric energy transmission and use: one is the direct electrical connection, all electrical equipment in each voltage level, through wires, circuit breakers or isolating switches, etc. direct contact with electricity. The second is that there is no direct connection of electricity, but energy exchange (transmission) is carried out through the magnetic field in the air gap. For example, the windings of the transformer are connected through the air gap. The motor stators are also connected through the air gap.
How to understand electricity in electrical appliances?
I have been engaged in the electrical industry for many years, but there are not many people who delve into the connotation and extension of its definition. Electrical/electrical engineering, its extension covers microelectronics, photonics, and microcomputer application technology. But it seems to deviate from the electrical we are talking about. However, one thing is certain, everyone agrees that electrical appliances are specific object images, and electrical appliances are an untouchable classification concept! Electrical appliances and electricity, although the pronunciation of the two words is the same, one is the instrument of the device, and the other is the gas of the gas, but the meaning is different. Electrical appliances are electrical appliances for switching on and off circuits or regulating, controlling and protecting circuits and electrical equipment. Electrical appliances have a wide range of uses, diverse functions, various types, and different structures. Electrical appliances can be divided into: distribution electrical appliances, control electrical appliances, master electrical appliances, protective electrical appliances, executive electrical appliances, etc. according to their uses. Simply put, electrical appliances are a kind of equipment, such as transformers, generators, motors, etc. Electricity is a general term for disciplines or engineering fields such as the production, transmission, distribution, use, and electrical equipment manufacturing of electric energy. It can be said that electricity contains many things, it involves three aspects of electric energy conversion, utilization and research, including basic theory, application technology, facilities and equipment, etc. Therefore, electricity is a science, electricity is a technology, electricity is a field, electricity is an industry, and electricity is also a profession. In other words, electricity contains electrical appliances, or electrical appliances are a small part of electricity. Some time ago, I saw a college recruitment information on the Internet. Among them, there is such a “major direction of mechanical or electrical appliances”. It is obvious that the major of electrical appliances is wrong, and it should be electrical majors. It can be seen from this that for many non-electrical professionals, it is particularly easy to confuse the two terms electrical and electrical appliances. For majors, it is necessary to write electrical majors, not electrical appliances.
