I’ve played around with a power supplies in the past and each one seems to have a safety feature preventing electrocution even when touching something which has a current running through it. How does this work? How does the power supply know that’s it’s touching skin as opposed to another conductive material.
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What DC supplies are you talking about? If it is a low voltage supply electrocution is not possible if you do not price your body with electrodes.
50V and below is called Extra-low voltage (ELV) and has a very low risk of dangerous electric shocks. If you go down to the more common 12V system it is practically no risk.
The reason is your body resistance is so high that the current through it will me minimal. This means the energy transferred is minimal too and no damage is done.
A 12V car battery can deliver hundreds of amps but when you touch it you only get a small fraction of an amp. If you would attach it to an electrode close together and penetrate your skin or touch your tongue the resistance is a lot lower and the current can do damage or at least be felt,
Take a 9V battery, You only feel the current if you touch the poles of you lick on it not if you touch it with your skin.
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