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Why does the charger still have current after unplugging the plug?
Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.05.22
We may often encounter situations where when we unplug the charger plug from the socket, we can still feel the current by touching the metal part of the charger. This situation has raised concerns as there is a potential risk of electric shock due to sustained current. This article will explore the reasons why the charger is still charged after unplugging, and provide solutions to ensure safe use.
1. Capacitor charging effect
Chargers often contain capacitors, which can store electrical energy. When we unplug the plug from the socket, the charge stored in the capacitor is not immediately released. This means that even if the plug is unplugged, the capacitor can still provide current for a short period of time, causing the charger to remain charged. This phenomenon is called the capacitor charging effect.
2. Electromagnetic induction effect
Another possible reason is the electromagnetic induction effect. When we plug in the power adapter, the circuit in the adapter forms an electromagnetic field. When we unplug the plug from the socket, the electromagnetic field may cause induced current to be generated, resulting in the charger still being charged.
Solution
1. Wait for a moment: After unplugging the plug, you can wait for a moment for the capacitor to release its charge on its own. This can ensure that the current in the charger is eliminated, reducing the risk of electric shock.
2. Touch without metal parts: If you need to handle the charger immediately and cannot wait, it is best to avoid touching the metal parts to reduce the risk of electric shock. You can unplug the charger by gripping the plastic or insulated housing portion.
3. Regular maintenance and inspection: Regularly inspect the wires and plugs of the charger for damage to ensure its normal use. If any abnormalities are found, the charger should be replaced in a timely manner.
The continued charging of the charger after unplugging may be caused by the charging effect of the capacitor or electromagnetic induction effect. To ensure safe use, we can wait for a moment for the capacitor to release its own charge, or avoid touching the metal part of the charger. Regularly maintain and inspect the wires and plugs of the charger to ensure its normal use, and replace damaged chargers in a timely manner. Most importantly, if you have doubts about electrical equipment, you should seek professional assistance to ensure safe use.
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