I’ve tested it and it had electricity stored and started to change my phone for a second. How long does that electricity stay in, I’d it harmful for a charger or phone? I usually firstly unplug the
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It’s not harmful. Part of virtually all electrical equipment is a component called capacitor. It has many applications but the easiest to explain is that it acts as a mini-battery to help stabilise the voltage input. What you saw was a capacitor being drained. You will see the same effect on things like tvs where the standby light remains on for a second after you unplug them.
It can definitely be harmful if you disassemble an electrical equipment and touch a capacitor though.
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