Identifying the systems that would probably fail if there were a strong-enough EMP from either a massive solar CME, a nuclear EMP weapon, or a tactical EMP bomb, is easier to speculate thanĀ  items that might survive an EMP. Also, an EMP will be carried through overhead power lines (at the speed of light) and could instantaneously overwhelm power transformers along the grid with excess electrical current, causing the windings of the transformers to melt into a molten blob. After all that, the simple answer to what items might survive, are those items that do not contain semiconductors! If the device you are wondering about contains any digital interface whatsoever, then you can probably kiss it good-bye. Generally speaking, ranging from tools, to appliances, to heaters, to vehicles… if it has electronic circuits, it is vulnerable to EMP.
While the threat of an EMP to the degree of mass outages is apparently slim, the fact is that it is not zero.

Your scenario of 24 EMP devices being necessary to take down the US could be accurate if those devices were used at very low altitude. A solar EMP is a very real possibility and powerful enough to destroy our electric power distribution system and virtually all electrical equipment.
Most discussion on EMP is on the effects on infrastructure systems such as the obvious electric power system. Survival blog topics for a life of preparedness and risk awareness; emergency and disaster or threats thereof. The power lines will also carry the EMP (at the speed of light) far and wide into homes and businesses in search of semiconductors to fry.
From the research I’ve done, commercial airlines are now computer controlled and use electricity to fly, which means that when EMP hits, they would be shut down.

A typical older vehicle with a solid metal body, using a ground strap connected to a grounding rod could be an example, but note that the ground is important, since you can’t actually insulate against EMF, but you can divert the pulse around sensitive components to ground.
It would take some significant research to list the vehicles built without these electronic systems, but suffice it to say that most any vehicle today is vulnerable to EMP failure (if close enough to the EMP source).

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