2. Now it has been widely extended to the folk perspective. From the perspective of ordinary people, it mainly refers to some household appliances that provide convenience for life, such as TV sets, air conditioners, refrigerators, washing machines, various small household appliances and so on. Electrical appliances are the general term, and electricity refers to: alternating current, direct current, high voltage electricity and low voltage electricity. Therefore, there are AC appliances, DC appliances, high-voltage appliances, low-voltage appliances, household appliances, industrial appliances, and so on. Digital itself is not an electrical appliance, but a technical attribute adopted by the product, which only needs alternating current or direct current.
3. According to the function, electrical appliances mainly include the following five categories:
(1) Electrical appliances used to connect and disconnect circuits, such as contactors, knife switches, load switches, disconnectors, circuit breakers, etc.
(2) Electrical appliances used to control the circuit, such as electromagnetic starter, autotransformer starter, rheostat and control relay.
(3) Electrical appliances for switching circuits, such as change-over switches and main electrical appliances.
(4) Electrical appliances for detecting circuit coefficients, such as transformers and sensors.
⑤ Electrical appliances used to protect circuits, such as fuses, circuit breakers and lightning arresters.