Would it fry things that weren’t plugged in and running?
Supposedly the EMP pulse has the potential to strike all computerized and electrical devices, plugged in or not, unless they are sheilded or protected by something like a Faraday Cage.
An EMP can travel through the air and impact stand-alone devices like auto computers, cell phones and radios. Or it can enter a conductor, like grid power cables and wires, and travel through them to strike devices plugged in, like TV sets, home computers, etc.