http://games.chruker.dk/eve_online/inventory.php?category_id=11

Enemy ------ Low Resist ---- Damage Dealt

Amarr ------- EM/Therm ---- EM(47%)/Therm(42%)
Angel ------- Explosive ---- Exp(62%)/Kin(22%)
Blood ------- EM ---- EM(50%)/Therm(48%)
Caldari ------ Kin/Therm ---- Kin(51%)/Therm(48%)
Drones ------ EM ----
Gallente ----- Therm ---- Kin(60%)/Therm(39%)
Guristas ----- Kinetic ---- Kin(79%)/Therm(18%)
Mercs ------- Thermal ---- Omni
Minmatar ---- Thermal ---- Exp(50%)/Kin(31%)
Mordus ------ Kinetic ---- Kin(70%)/Therm(30%)
Sansha ------ EM/Therm ---- EM(53%)/Therm(47%)
Serpentis ---- Kin ---- Therm(55%)/Kin(45%)

Stacking Penalties for Similar Items:

1 - 100%, 2 - 87%, 3 - 57%, 4 - 28%, 5 - 10.5%


There are four basic kinds of electronic warfare:

Electronic Counter Measures (ECM, or "jams") - Caldari
Weapon disruption (Tracking and Guidance Disruption) - Amarr
Remote Sensor Dampening ("damps") - Gallente