10.16. Electrical Safety
10.16.1. Threshold of Perception
The perception of a current through human skin is dependent on frequency, current density, effective electrode area, and skin site/condition. Current duration also is a factor, in the case of DC determining the quantity of electricity and thereby the electrolytic effects according to Faraday's law (see Section 7.8).
DC
If a DC source coupled to two skin surface electrodes is suddenly switched on, a transient sensation may be felt in the skin. The same thing happens when the DC current is switched off. This proves that many nerve endings are only sensitive to changes in a stimulus and not to a static stimulus. At the moment a DC is switched on, it is not only a DC, it also contains an AC component. ...
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