Answer by
tamarawilhite (17883)
EMP stands for Electro-Magnetic Pulse. It is a wave of electromagnetism, which will fry all electronics in range that are not enclosed in a Faraday cage. An EMP pulse fries computers, electronics, and car solenoids (so that they do not start). But most importantly, an EMP overloads electric substations, shutting down the electrical grid.