The methods of electrical appliance detection, inspection, certification, and testing involve many aspects. The following is a detailed summary of these methods:

1. Electrical appliance detection methods
Physical detection:
Resistance detection: Use tools such as multimeters to measure the resistance value and determine whether the resistance has changed or is damaged. There are corresponding detection methods for fixed resistors, cement resistors, and fuse resistors.
Transformer detection: Observe the appearance of the transformer to check whether there are any abnormal phenomena, such as whether the coil lead is broken or desoldered, whether the insulating material has burnt marks, etc. At the same time, insulation performance tests and identification of primary and secondary coils are also required.
Sensory detection:
Sensory detection is particularly suitable for commercial enterprises to accept goods and consumers to purchase goods. Its advantages are simple, fast, and easy, without complex instruments and equipment, and non-destructive to goods.
Sensory detection mainly inspects the appearance of electrical products, and can also inspect the sound quality, smell, etc. of electrical appliances through hearing, smell, etc.
2. Electrical appliance inspection methods
Electrical appliance inspection usually inspects the intrinsic quality of electrical products, including but not limited to the following aspects:

Safety performance inspection: Inspect the electrical safety performance of electrical products, such as insulation resistance, withstand voltage strength, etc.
Functional performance test: Check whether the functions of electrical products are normal, such as the image color of the TV, the sound quality of the audio, etc.
Environmental adaptability test: Check the adaptability of electrical products in different environments, such as temperature, humidity, vibration, etc.
3. Electrical certification methods
Electrical certification is the evaluation and recognition of the quality and safety of electrical products. Common electrical certification methods include:

CCC certification: China Compulsory Product Certification, which implements mandatory testing and review of products listed in the "First Batch of Products for Compulsory Product Certification" issued by the General Administration of Quality Supervision, Inspection and Quarantine and the National Certification and Accreditation Administration.
CQC certification: Voluntary product certification of the China Quality Certification Center. Obtaining a CQC product certification certificate means that the product is certified by a national certification body as safe and in line with the national response quality standards.
CE certification: European compulsory product certification, indicating that the product meets the safety, hygiene, environmental protection, and consumer protection requirements of European directives.
FCC certification: The Federal Communications Commission of the United States conducts mandatory certification on the electromagnetic compatibility of electronic equipment and the personal safety of operators.
In addition, there are UL certification (US voluntary product safety certification), ETL certification (US/Canada voluntary product safety certification), GS certification (European voluntary product safety certification), EMC certification (European mandatory electromagnetic compatibility certification), CSA certification (Canada mandatory product safety certification), PCT certification (Russian mandatory product certification), TUV certification (German mandatory product safety certification), PSE certification (Japanese mandatory safety certification) and EK-MARK certification (South Korean mandatory product certification).

IV. Electrical appliance testing methods
Electrical appliance testing is to test the various performance indicators of electrical products to verify whether they meet the design requirements or relevant standards. Common electrical appliance testing methods include:

Performance testing: testing the various performance indicators of electrical products, such as power, efficiency, voltage, current, etc.
Reliability testing: testing the reliability and durability of electrical products by simulating conditions such as long-term use or harsh environments.
Compatibility testing: testing the compatibility of electrical products with other equipment or systems, such as compatibility testing between televisions of different brands and models.
In summary, the methods of electrical appliance inspection, testing, certification, and testing involve many aspects and need to comprehensively consider factors such as product characteristics, usage environment, and relevant standards. In actual operation, appropriate inspection, certification, and testing methods should be selected according to specific circumstances.