There are various attacks in the Super Smash Bros. series that cause the electric effect. Targets hit by these attacks will be shocked and spark for a second or two. Electric attacks have other effects:
In the first three installments of Smash Bros., electric attacks always emit very loud sounds on hit. This has been toned down to a "buzzing" sound in Smash 4, making them much quieter.
The majority of magic, energy, and PK attacks use the electric effect, though this is hardly universal. The electric effect can be confused with the paralyze effect, as the only common moves that can paralyze use electrical sound effects.
List of electric attacks
By enemies and bosses
By stage hazards
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