The traditional 電 put 雨 (rain) on top of a lightning bolt striking a field — electricity as the storm's flash. Simplified 电 keeps just the bolt: a field 田 shape with the lightning's tail whipping out the bottom.
电 powers the modern vocabulary like nothing else: 电脑 (electric brain — computer), 电视 (electric seeing — TV), 电话 (electric speech — telephone), 电影 (electric shadow — movie). Chinese built its entire technology lexicon by pairing 电 with body parts and senses, which makes new words wonderfully guessable. Learn 电 and half of the gadget aisle reads itself.
A lightning bolt whipping its tail out of a field — ELECTRICITY.
电影 'electric shadow' (movie) is often praised as one of the most poetic tech words in any language.