As a student majoring in electrical engineering, have you encountered such a problem? When relatives, friends and even neighbors around you ask you what major you are studying in school, you answer that majoring in electrical engineering. Most of them understand it as electrical appliances, and they want to repair electrical appliances. , and then they go on to ask if you can repair household appliances? I don't know if you have had such an experience.
The key is that they understand electricity as electrical appliances, and the meanings of electrical and electrical are completely different. At the junior college level in my country, there is a major called electrical automation technology, an undergraduate major called electrical engineering and automation, and a graduate major called electrical engineering. These majors can be referred to as electrical majors. So what is the difference between the words electrical and electrical? What do they stand for?
From the point of view of division of disciplines
Electricity, electronics and electrical appliances all belong to electrical engineering disciplines. The term electrical engineering comes from Japan, and the "qi" in it comes from the translation of Western foreign languages (in the beginning of Western industry, power machinery was driven by steam turbines, and later used for power generation, so \\\\'electric\\\\' began It generally refers to industrial power, and now electrical refers to electricity), and electrical engineering is also the engineering of electricity.
1. Electrical: Electronics, electrical appliances and electricity all belong to electrical engineering. It is an abstract concept that does not specifically refer to a device or device, but refers to the entire system and the category of electronics, electrical appliances and electricity.
2. Electricity: Electricity is the strong electricity part of electrical engineering, which 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) ; Power is divided into high-voltage power, voltage transformation and distribution;
3. Electronics: Electronics refers to the weak current part of electrical engineering, which mainly studies the processing and transformation of information; 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, and LED lamps. Electronic devices: an electronic functional device consisting 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 the narrow sense refer to switches in the industrial field. In the civil field, electrical appliances refer to power-consuming electrical equipment (ie, electrical equipment such as washing machines, TVs, and refrigerators). Academic definition: any electrical equipment that automatically or manually turns on or off the circuit, continuously or continuously changes the circuit parameters, and realizes the switching, control, protection, detection and adjustment of the circuit according to specific external signals and requirements. for electrical appliances.
Electrical appliances generally refer to all electrical appliances, such as: TV sets, refrigerators, fans, computers, etc. From a professional point of view, it mainly refers to the connection and disconnection of circuits, and the transformation of circuit parameters to achieve Electrical installations, equipment and components for the control, regulation, switching, detection and protection of circuits or electrical equipment.
Classification 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-electricity-controlled electrical appliances that rely on external force or changes in some non-electrical physical quantities to act, such as knife switches, travel switches, buttons, speed relays, temperature relays, etc.
Classification by action principle
1) Manual electrical appliances are electrical appliances that are operated by hand or rely on 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 uses electrical energy, electrical equipment and electrical technology to create, maintain and improve confined spaces and environments, covering three aspects of electrical energy conversion, utilization and research, including basic theory, application technology, facilities and equipment. For example: grounding resistance tester for building electrical testing instruments, low-voltage megger, comprehensive tester for low-voltage electrical appliances, etc.
Why it is called "electrical" mainly refers to two ways of power 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 electrical contact. 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 by air gaps.
How to understand electrical appliances?
Engaged in the electrical industry for many years, but there are not many people who study the connotation and extension of its definition. Electrical/Electrical Engineering, whose epitaxy covers microelectronics, photonics, and microcomputer application technology. But it seems to deviate from the electrical we are talking about. However, it is certain that everyone agrees that electrical appliances are specific object images, and electrical appliances are intangible classification concepts!
Electrical and electrical, although the pronunciation of the two words is the same, one is the device of the device, and the other is the gas of the gas, but the meanings are different.
Electrical appliances are electrical appliances used to connect and disconnect circuits or to regulate, control and protect circuits and electrical equipment. Electrical appliances have a wide range of uses, diverse functions, a wide variety of types, and different structures. Electrical appliances can be divided into: distribution electrical appliances, control electrical appliances, master electrical appliances, protection electrical appliances, executive electrical appliances, etc.
Simply put, an electrical appliance is a device, such as a transformer, generator, motor, etc. Electricity is a general term for disciplines or engineering fields such as the production, transmission, distribution, use of electrical energy and the manufacture of electrical equipment. It can be said that electricity contains a lot of things, it involves three aspects of electric energy conversion, utilization and research, including basic theory, application technology, facilities and equipment.
Therefore, electrical is a science, electrical is a technology, electrical is a field, electrical is a profession, and electrical is also a profession. In other words, electrical appliances contain electrical appliances, or electrical appliances are a small part of electrical appliances. Some time ago, I saw the recruitment information of a college on the Internet.
Among them, there is such a "mechanical or electrical professional direction", it is obvious that the electrical major is wrong, and it should be an electrical major. It can be seen from this that for many non-electrical professionals, it is very easy to confuse the terms electrical and electrical.