as said it the artical

"exposed electrical conductors, such as wires, or conductive tracks on printed circuit boards, where exposed."

so its not all devices that are eletrical

i,m sure an eletric kettle would only boil water in it but still work after. Just I won,t have a computer to use as i have a cup of tea.

Gallium Arsenide:-

http://www.eren.doe.gov/pv/gallium.html

(okay not sure maybe i got that its static residance wrong still a interesting materail)

I think your find this type of bomb is aimed at TV & radio Stations to cause news blackouts as most modern military equipment will be protected.

like some planes an cope with mobile phone where others can,t.

it all boils down to the design of the eletrical equipment. This is not a 100% kill of equipment type of device but against large tv &/or radio masts it have a field day.