From the perspective of disciplines
Electricity, electronics and electrical appliances belong to electrical engineering. The term “electrical engineering” comes from Japan, in which the “gas” comes from the Western foreign language translation (the beginning of Western industry, power machinery driven by the steam turbine, and later with the power, so “electrical” began to lack of industrial power, Refers to electricity), electrical engineering is the electrical engineering.
1, electrical: electronics, electrical appliances and electricity are all electrical engineering, it is an abstract concept, not specifically refers to a device or device, but refers to the entire system and electronics, electrical and power areas.
2, electricity: electricity is the electrical power of the electrical part of the main study of the provision of electricity (ie, the generation of electricity – power generation system), transmission (power line transmission), transformation (high and low voltage transformers, transformers, circuit breakers, ; Power is divided into high voltage, voltage variable distribution;
3, electronic: electronic means that the electrical engineering of the weak part of the main research information processing, transformation; electronic can be divided into two: electronic circuits and electronic systems. Electronic components: electronic components such as diodes, transistors, silicon, LED lights. Electronic devices: an electronic function device consisting of a single and multiple circuit boards.
Electronic system: the system consisting of electronic equipment – weak engineering system.
4, electrical appliances: electrical equipment is specific, narrow sense of the electrical means in the industrial field switch. In the civilian areas, electrical appliances are electrical appliances (ie, electrical equipment such as washing machines, televisions, refrigerators).
Academic definition: all according to the specific signals and requirements, automatic or manual connection or disconnect the circuit, continue or continuously change the circuit parameters, to achieve the circuit switching, control, protection, detection and regulation of electrical equipment are called For electrical appliances.
Electric refers to all the electrical appliances, such as: televisions, refrigerators, fans, computers, etc., from a professional point of view, mainly refers to the circuit connected, breaking, the circuit parameters to transform Electrical equipment, equipment and components for the control, regulation, switching, inspection and protection of circuits or electrical equipment.
Classification by working principle
1) electromagnetic appliances according to the principle of electromagnetic induction to work, such as contactors, various types of electromagnetic relays and so on.
2) non-electric control electrical appliances rely on external forces or a non-electric physical changes in the action of electrical appliances, such as knife switches, limit switches, buttons, speed relays, temperature relays and so on.
According to the principle of action classification
1) manual electrical appliances or by mechanical force to operate the electrical appliances, such as manual switches, control buttons, travel switches and other master electrical appliances.
2) automatic electrical appliances by means of electromagnetic force or a change in the amount of physical operation of the electrical appliances, such as contactors, various types of relays, solenoid valves and so on.
Electricity is a science that uses electricity, electrical equipment and electrical technology as a means to create, maintain and improve qualified space and environment, covering three aspects of energy conversion, utilization and research, including basic theory, application technology, facility equipment and so on. For example: building electrical testing equipment grounding resistance tester, low voltage megger, low-voltage electrical integrated tester.
Why is the “electrical”, mainly refers to the power transmission and the use of the way there are two: First, the direct electrical connection, each voltage level within all electrical equipment, through the wire, circuit breakers or disconnectors, etc. Direct connection of electricity. Second, there is no direct contact with electricity, but through the air gap within the magnetic field for energy exchange (transmission), such as the transformer between the windings is through the air gap. Between the motor stator are also through the air gap to contact.
Electrical electrical appliances, how to understand it? Engaged in the electrical industry for many years, but the depth of its definition of the connotation and extension are few. Electrical / electrical engineering, its epitaxy covers microelectronics, photonics, and microcomputer application technology. But it seems to have talked with us about the electrical deviation. But, can be sure that we all agree that the electrical is a specific object image, electrical is not touch the concept of classification!