An EMP (Electro Magnetic Pulse) is created as a byproduct of a nuclear explosion. A nuclear blast at high altitude produces a highly charged, rising electromagnetic field called a HEMP(High Altitude Electromagnetic Pulse). The Electro Magnetic Pulse has a damaging effect to all electronic equipment in its surrounding. Because of the high altitude the area of coverage is enormous. Yet another threat comes from the so called E-Bombs. These weapons converts explosive energy into microwave energy and produces a ramping charge similar to the one produced by a nuclear explosion | 
