"Elektrisch" means "electric" or "electrical", and it's normally only used in its actual physical/technological context. Things can be "elektrisch", for example "elektrische Eisenbahn" (electric train) oder "elektrische Ladung" (electric charge), but people better not be electric ;). Sometimes "elektrisch" is used figuratively and in regards to a person or a relationship - it's usually used to describe some sort of tension. However, you'd really need that in a context in order to interpret it properly. You can't use "sympathisch" with "gefallen". You can either say: "Sie ist sympathisch" or "Ich finde sie sympathisch", or you can say "Sie gefällt mir".