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Try this for example, get about 7 9volt batteries and attach them in series to get 63 volts wet your fingers and touch the 2 electrodes you'll feel a barely noticeable shock for a split moment then you'll feel nothing.
With alternating current [AC], there is a feeling of electric shock as long as contact is made. In contrast, with direct current [DC], there is only a feeling of shock when the circuit is made or broken. While the contact is maintained, there is no sensation of shock. Below 300 mA DC rms, there is no let-go phenomenon because the hand is not involuntarily clamped. There is a feeling of warmth while the current travels through the arm. Making or breaking the circuit leads to painful unpleasant shocks. Above 300 mA, letting go may be impossible. The threshold for ...sorry, you cannot view external links. To see them, please
REGISTER or LOGINi.e. DC is less efficient than AC at torturing & killing people but can still do both. Subjecting primary-school children to "7 9volt batteries" so they experience an electric shock will probably loose you your job as a teachers assistant.[ The touch-sensitive-switches made with 555 chips do not deliver any electric shock sensation ]