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The direct result of a space storm would be the breakdown of the electrical grid, the report warned.
John Kappenman, an analyst with Metatech Corporation, a company that studies the effect of electromagnetic interference on power systems, said in the report that damaged transformers take a long time to repair.
In well-documented cases involving heat failures in the transformers that undergird the power system, he said it has taken 12 months or more to replace the damaged units with new ones.
Originally posted by lucentenigma
If the incoming wire (primary current/power from wall) has less turns around the core then the outgoing wire (secondary current/power to your device) has turns around the core it will take the 120v and bring it down to a smaller usable amount. If the incoming wire has more turns then the outgoing wire around the core it will increase the voltage higher then 120v. If the poles do shift the transformer (magnetic iron core) would be reversed you would have 120v+ going into everything plugged into a wall jack frying them instantly.