Under certain conditions, leakage is inevitable. Static electricity in electronic products is unavoidable. Just as our bodies accumulate static electricity in autumn and winter, we often hear a "snap" when wearing a sweater after removing chemical fibers. In the dark, you can even see small sparks on your clothes. If the power outlet is grounded, basic power adapters or other electronic products generally won't have static electricity. Here are a few situations where electronic products might accumulate static electricity:

　　1. A small amount of current flows through the metal casing of the electronic product, which is felt by the human body as a leakage. This situation has been well resolved with advanced technology; a circuit is formed inside the electronic product, and the static electricity is effectively released, so it's almost impossible to experience in special circumstances.

　　2. The AC plug of the electronic product's power adapter is not properly grounded. If you experience leakage when touching the electronic product, you can do a simple test yourself. Connect the wire to the ground. Alternatively, you can find an indoor drain pipe and connect a wire from the drain pipe to the metal casing of the electronic product. This will effectively conduct the static electricity on the electronic product's casing to the ground and release it. When replacing electronic components, touching the floor with your hands may damage the components. Static electricity from the human body can cause monitors or printers to malfunction. Therefore, it is best to mold your hands around metal objects to discharge static electricity. It is also best to wear items that do not generate static electricity, such as shoes and clothing.

　　Thirdly, when you touch the positive terminal of the DC power supply of a power adapter with your hands that are damp, and your body is also in contact with a damp ground, the higher the DC voltage, the more pronounced the tingling electric shock will be. Under normal circumstances, this situation is unlikely to occur, as the ground and hands are rarely made particularly wet. Furthermore, it is extremely dangerous to touch the positive terminal of the DC power supply of a power adapter barefoot on a damp ground. Even if it were safe, it must be warned: do not imitate this!

　　The above describes the static electricity phenomenon of ordinary power adapters, not AC electric shock. Besides static electricity, there is another technical parameter in electronics terminology called leakage current.

　　In household appliances, leakage current refers to the safe current between the operating electrical parts and the insulated metal. Appliances used with 220V AC power have a leakage current of 0.25mA. This safe leakage current is very small. Leakage current refers to the current that flows through the surrounding medium or insulating surface between insulated metal parts or between a live part and a grounded part when a voltage is applied to a fault in the absence of voltage. There are four types of leakage current: semiconductor component leakage current, power supply leakage current, capacitor leakage current, and filter leakage current.

　　If a power adapter or other electronic product experiences unsafe electrostatic discharge, electric shock beyond the safe leakage voltage, or a leakage current that feels unsafe, and the average consumer cannot identify the cause, Yongletong recommends stopping use and contacting the manufacturer to find the specific reason.

　　Besides the electrostatic discharge and leakage current within the safety standards of chargers mentioned above, there is also AC leakage current caused by unsafe power adapters, which is extremely dangerous. Unsafe power adapters omit many safety components to save costs. Such power adapters can conduct radiation and are inconsistent with many other safety standards. Unsafe products pose safety hazards. Unsafe switching power supplies are often exposed to dust, humidity, high temperatures, and lightning strikes. Short circuits are prone to occur under conditions of vibration and shock. Once a short circuit occurs, non-safe power supplies can easily cause electric shock and fire. We strongly recommend that customers carefully choose non-safe power supplies for the sake of their own brand reputation and the personal and property safety of end customers, so as to avoid irreparable losses.

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