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  • Super Simple Electrocardiogram (ECG) Circuit

    It's not the same thing - here you are deliberately connecting the terminals to the skin in such a way that the heart is on the path between them, and likely leaving the connection in place for some time. So the consequences of your mains adaptor developing a fault, unlikely as that may be, can be far worse.I pull the cord out of my lawnmower before clearing the blade, even though there's very low likelihood the power switch will fail closed while I'm doing it. There is no failure mode of a battery, as far as I know, which can cause it to generate 110V AC or similar by itself.

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