I agree as I stated previously a mylar bag is not EMP proof.
simplifying it is not accurate.
E1 – The time duration of this phase is about 1 – 5 NANOseconds. This part is when the bomb goes off, the gamma radiation that is in the bomb actually cascades down like a blanket to the earth. Whiles it’s cascading down it knocks electrons out of the air and they are charged with energy from the bomb. Once that energy reaches electronics, whether they be plugged in, turned off, in pants pockets, on tables, in the air, or wherever, the microchips get short circuited and ruined. This is extremely damaging because microchips must be replaced, they cannot be repaired.
E2 – This happens directly after the E1 phase. This lasts anywhere from 1 microsecond to 1 second in length. This is the initial energy that surges through the national power grid. The dangerous part of this is that it has the ability to arc, or jump, from one contact to another. As an example, if there is a blender on a counter top that is about 4 inches away from the outlet, but it is not plugged into the outlet, the energy could still hit the blender. Research has shown that the energy can jump about 6 inches. The wiring in a house is connected to the power grid. The energy comes through the grid, into the house, to the outlet, jumps from the outlet to the blender, shorting it out.
E3 – This is the last big pulse from the EMP blast. This lasts much longer than the other two phases, about 10 seconds to a few minutes. This acts just like a Geomagnetic Storm or Solar Flare. The energy from this is dispersed through the entire national grid. One of the biggest dangers of this is the EMP attack could happen as an example on the east coast and only the east coast would be affected by the E1. The E2 and E3 phase would travel through the national grid, power lines, telephone lines, rail road tracks and other long metal conductors all the way to the west coast and destroy the grid there too.
So anything that has a microchip and is not protected from EMP E1 is vulnerable even if it's not grounded.
Any electronic or electrical device is vulnerable to an E1, E2, E3 if plugged into grid. Any electrical device is vulnerable to an E2 even if not plugged in, if near other equipment plugged into the grid by it arcing up to 6 feet away.