The relationship between electricity, electronics, electrical, and electrical appliances

From the point of view of disciplinary division

Electricity, electronics and appliances all belong to the discipline of electrical engineering. The word electrical engineering comes from Japan, where the "gas" comes from the Western foreign translation (at the beginning of Western industry, power machinery are driven by steam turbines, and later used to generate electricity, so "electrical" began to refer to industrial power, and now electrical refers to electricity), electrical engineering is also the engineering of electricity.

1, electrical: electronics, electrical appliances and electricity belong to electrical engineering, it is an abstract concept, not specifically refers to a device or device, but refers to the entire system and the category of electronics, electrical appliances and electricity.

2, power: power is the strong part of electrical engineering, mainly studying 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, voltage transformer distribution;

3. Electronics: Electronics refers to the weak current part of electrical engineering, mainly studying the processing and transformation of information; Electronics can be divided into two parts: electronic circuits and electronic systems. Electronic circuits (Electronic components: electronic components that make circuit boards and electronic designs, such as diodes, transistors, silicon, and LED lights. Electronic device: An electronic functional device consisting of a single and multiple circuit boards). Electronic system: A system composed of electronic equipment, namely, a 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 civil field, electrical appliances refer to power-consuming electrical equipment (that is, electrical equipment such as washing machines, televisions, refrigerators). Academic definition: according to the specific signals and requirements of the outside world, automatically or manually on or off the circuit, continue or continuously change the circuit parameters, to achieve the circuit switching, control, protection, detection and regulation of electrical equipment are called electrical appliances.

Electrical appliances generally refer to all electrical appliances, such as TV sets, refrigerators, fans, computers, etc., from a professional point of view, mainly refers to the electrical devices, equipment and components used to switch on and off the circuit and transform the circuit parameters to achieve the control, regulation, switching, detection and protection of the circuit or electrical equipment.

Classification by working principle

1) Electromagnetic appliances work according to the principle of electromagnetic induction, such as contactors, various types of electromagnetic relays, etc.

2) Non-power control electrical appliances that rely on external forces or changes in some non-electrical physical quantity, such as knife switches, stroke switches, buttons, speed relays, temperature relays, etc.

Classification by principle of action

1) Manual electrical appliances operated by hand or relying on mechanical force, such as manual switches, control buttons, travel switches and other master electrical appliances.

2) Automatic electrical appliances that operate automatically by means of electromagnetic force or changes in a physical quantity, such as contactors, various types of relays, solenoid valves, etc.

Electricity is a science that uses electric energy, electrical equipment and electrical technology as a means to create, maintain and improve the limited space and environment, covering the conversion, utilization and research of electric energy, including basic theory, application technology, facilities and equipment. For example: ground resistance tester of building electrical testing instrument, low voltage megohm meter, low voltage electrical comprehensive tester, etc.

Why is it called "electrical", mainly refers to the power transmission and use of two ways: one is a direct electrical contact, all electrical equipment in each voltage level, through the wire, circuit breaker or isolation switch, etc., have a direct electrical contact. The second is that there is no direct connection of electricity, but the energy exchange (transmission) through the magnetic field in the air gap, such as the winding of the transformer is connected through the air gap. The stator of the motor is also connected through the air gap.

How to understand the meaning of electricity to electrical appliances? Engaged in the electrical industry for many years, but the connotation and extension of its definition are not many. Electrical/electrical engineering, its extension covers microelectronics, photonics, and microcomputer application technology. But it seems to deviate from what we're talking about with electricity. However, you can be sure that everyone agrees that electrical appliances are specific object images, and electrical is an untouchable classification concept!