Broadly refers to all electrical appliances, such as televisions, refrigerators, fans, computers, etc. From a professional perspective, it mainly refers to the connection, disconnection, and transformation of circuit parameters to achieve circuit changes. Or electrical equipment, equipment and components for the control, regulation, switching, detection and protection of electrical equipment.
Classified by working principle
1) Electromagnetic appliances work according to the principle of electromagnetic induction, such as contactors and various types of electromagnetic relays.
2) Non-electricity-control electrical appliances Electrical appliances that act 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 Electrical appliances that are operated by hand or relying on mechanical force, such as manual switches, control buttons, and travel switches.
2) Automatic appliances 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 limited space and the environment. It covers three aspects of electrical energy conversion, utilization, and research, including basic theory, applied technology, and facilities. For example: ground resistance tester for building electrical testing instruments, low voltage megohmmeter, comprehensive tester for low voltage electrical appliances, etc.
Why is it called "electrical"? There are mainly two ways to transmit and use electrical energy. One is the direct electrical connection. All electrical equipment in each voltage level has wires, circuit breakers or disconnectors. 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. For example, the windings of the transformer are connected through the air gap. Motor stators are also connected through air gaps.
What is the understanding of electrical appliances? Engaged in the electrical industry for many years, but there are not many people who delve into its definition and extension. Electrical / electrical engineering, whose extension covers microelectronics, photonics, and microcomputer application technology. But it seems to deviate from the electrical we are talking about. However, to be sure, everyone agrees that electrical appliances are specific object images, and electrical is an untouchable classification concept!