What the title says- is it as it is often portrayed in cartoons?
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The Death Penalty Information Centre describes the process (which is no longer used in the United States):
For execution by the electric chair, the person is usually shaved and strapped to a chair with belts that cross his chest, groin, legs, and arms. A metal skullcap-shaped electrode is attached to the scalp and forehead over a sponge moistened with saline. The sponge must not be too wet or the saline short-circuits the electric current, and not too dry, as it would then have a very high resistance.
Given the head is shaved, and wet and covered with an electrode, the person's hair is not able to stand on end as shown in the cartoon. Cartoons intended for children do not offer a realistic portrayal of execution by electrocution:
...the prisoner's eyeballs sometimes pop out and rest on [his] cheeks. The prisoner often defecates, urinates, and vomits blood and drool. The body turns bright red as its temperature rises, and the prisoner's flesh swells and his skin stretches to the point of breaking. Sometimes the prisoner catches fire....Witnesses hear a loud and sustained sound like bacon frying