Electromagnetic pulse

An electromagnetic pulse (also known as EMP) is a weapon that discharges a powerful wave of electromegnetic energy. On Earth, EMP was discovered by accident. Other than the Tau'ri, other races are known to have used EMP. All Ancient technology are apparently impervious to EMP.

Uses
EMP was used a fair number of times over the years.
 * An EMP was launched into the event horizon of an incoming Stargate in the hopes of stopping Anubis' Stargate destroyer, but the device was only damaged in the process.
 * Caius' cargo ship was equipped with EMP. Vala Mal Doran used the device to override the systems on Lucian Alliance Al'kesh vessels, so that they could escape.
 * An F-302 discharges EMP due to a concussive force interfering with the artificial gravity field generated by the inertial dampeners. They used that technique to shut down the electronic systems in the Rand Protectorate building.
 * An overloaded Naquadah generator, when detonated releases a massive pulse of EM energy. The Atlantis Expedition used that technique in combatting a nanite outbreak in Atlantis.