The design and construction of electronic circuits to solve practical problems is an essential technique in the fields of electronic engineering and computer engineering.
At the passage of an electrical current, the skin shows a resistance that is normally within the 100 kOhm to 1 MOhm range.
Such resistance decreases during periods of emotional stress.
The changes of the resistance are particularly significant on the palm of the hands and on the plant of the feet.
Moreover, the surface of the skin shows an electrical potential, that can reach up to 50mV and that can equally be influenced by emotional states.
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