I want to know the purpose of a component named "EL 8+7 G8025" which was found inside a Nokia charger.
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Possibly an EL817 optocoupler, but I'll reserve final judgement until I see the photo. If it's a semiconductor the only common 4-pin parts used in this sort of application are bridge rectifiers and opto-couplers. There are other 4-pin parts such as common-mode chokes, but they look different.
Bridge rectifiers look more like this: