Well, what would happen, are you aware of the Carrington event?
Telegraph systems all over Europe and North America failed, in some cases shocking telegraph operators. Telegraph pylons threw sparks and telegraph paper spontaneously caught fire. Some telegraph systems continued to send and receive messages despite having been disconnected from their power supplies.
I imagine any country that uses electricity and does not manufacture transformers and other electrical components would be reduced to the stone ages as we have forgotten how to do anything without it.
I'm not sure on how you would prevent it, maybe a thick lead lined box to store your electrical item inside?
Its a case of when not if..
edit on 22-2-2013 by Markive because: my terrible keyboard skills