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I do not know much about electricity, except Alternating Current is what we use in the UK, which I understand is produced by a magnetic field and, if severed, ceases to function.
Howeever, Direct Current is straight forward suppy of electricity and |I vaguely remember a James Bond film in which a power cable was cut - it jumped around then fell in the water and electricuted the character Odd Job ...
I am looking for an analogy to illustrate the danger of an severed energy supply