Power, electronics, electrical, electrical appliances from the perspective of discipline division
Electricity, electronics and electrical appliances are all subject to electrical engineering. The term "electrical engineering" comes from Japan. The "qi" comes from Western foreign language translation. (At the beginning of Western industry, power machinery was driven by steam turbines, and later used to generate electricity. Therefore, "electricity" began to lack industrial power, and now electric pan Refers to electricity), electrical engineering is also the engineering of electricity.
1. Electrical:
Electronics, electrical appliances, and electricity are all electrical engineering. It is an abstract concept, not specifically a device or device, but the entire system and the scope of electronics, appliances, and electricity.
2. Electricity:
Electricity is the strong part of electrical engineering. It mainly studies the provision of electrical energy (ie, the generation of electrical energy - power generation systems), transmission (power line transmission), transformation (high and low voltage transformation, transformers, circuit breakers, contactors); High voltage, voltage and power distribution.
3. Electronics:
Electronics refers to the weak part of electrical engineering, mainly dealing with 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 circuit boards and electronic design, such as diodes, triodes, silicon, LED lamps. Electronic devices: an electronic functional device consisting of single and multiple boards). Electronic system: A system consisting of electronic devices—weak electrical engineering systems.
4. Electrical appliances:
Electrical appliances are specific equipment, and electrical appliances in the narrow sense refer to switches in the industrial field. In the civilian sector, electrical appliances refer to electrical equipment (ie, electrical equipment such as washing machines, televisions, refrigerators).
Academic definition: Any electrical equipment that automatically or manually turns on or off the circuit according to specific signals and requirements of the outside world, continuously or continuously changes the circuit parameters, realizes switching, control, protection, detection and adjustment of the circuit. For electrical appliances.
Electrical appliances generally refer to all electrical appliances, such as: televisions, refrigerators, fans, computers, etc. From a professional point of view, it is mainly used to switch on and off the circuit, and to change the circuit parameters to achieve Electrical equipment, equipment and components for the control, regulation, switching, detection and protection of electrical circuits or electrical equipment.
Electrical appliances are classified according to working principle
1) Electromagnetic appliances work according to the principle of electromagnetic induction, such as contactors, various types of electromagnetic relays, etc.
2) Non-electrical control appliances that rely on external forces or certain non-electrical physical quantities to change, such as knife switches, travel switches, buttons, speed relays, temperature relays, etc.
Electrical appliances are classified according to the principle of action
1) Manual electrical appliances that operate by hand or rely on mechanical force, such as manual switches, control buttons, travel switches, and other main electrical appliances.
2) Electrical appliances that are automatically operated by means of electromagnetic force or a certain physical quantity, such as contactors, various types of relays, solenoid valves, etc.
Electrical is a science that uses electric energy, electrical equipment and electrical technology to create, maintain and improve limited space and environment, covering three aspects of power conversion, utilization and research, including basic theory, application technology, facilities and equipment. For example: grounding resistance tester for building electrical testing equipment, low-voltage megohmmeter, low-voltage electrical comprehensive tester, etc.
Why is it called “electricity� It mainly refers to two ways of power transmission and use: one is 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) through the magnetic field in the air gap, such as the connection between the windings of the transformer through the air gap. The stators of the motors are also connected by air gaps.
How to understand the electrical to electrical appliances? Engaged in the electrical industry for many years, but there are not many connotations and extensions of its definition. Electrical/electrical engineering, whose extension covers microelectronics, photonics, and microcomputer application technology. But it seems to be biased by the electricity we talked about. However, one can be sure that what everyone agrees is that electrical appliances are specific object images, and electrical is an intangible classification concept.
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