You can keep any unnecissary wires away from where your cat will be, say the cord to a cell phone charger, just keep it behind a closed door while it charges.
I like bitter apple as a taste repellant, some people use tabasco sauce, cats don't like that either.
Bitter Apple will evaporate after about 24 hours, and often have to re apply it, at least until the animal taste the object WHILE it's on there. I'm not sure how long the tobasco last for however, possible forever, and it might be mixed with something else I'm not sure, I'm sure someone else who has used that will chime in.
There are also wire covers you can get, they are like plastic tubing you put around the wires to protect them. I have some and got it from Ikea, and you can also get them from a place like Home Depot!