▁voltage , ▁current ▁and ▁duration ▁of ▁shock ▁can ▁be ▁used ▁to ▁calculate ▁the ▁amount ▁of ▁energy ▁applied ▁( in ▁J ou les ), ▁these ▁are ▁not ▁indic ators ▁of ▁the ▁intensity ▁of ▁the ▁stim ulus ▁or ▁how ▁it ▁may ▁be ▁perce ived ▁by ▁the ▁recip ient . ▁St atic ▁electric ▁shock s ▁that ▁are ▁experienced ▁in ▁daily ▁life ▁are ▁of ▁the ▁order ▁of ▁ 2 0 , 0 0 0 ▁to ▁ 2 5 , 0 0 0 ▁vol ts , ▁and ▁yet ▁are ▁not ▁pain ful ▁or ▁phys ically ▁dam aging ▁because ▁they ▁are ▁of ▁very ▁low ▁current . ▁ ▁Depending ▁on ▁design , ▁e - coll ars ▁coll ars ▁can ▁be ▁set ▁so ▁that ▁the ▁shock ▁delivered ▁is ▁only ▁m ild ly ▁un com fort able . ▁Variable ▁settings ▁of ▁this ▁kind ▁are ▁essential , ▁so ▁that ▁the ▁e - col lar ▁col lar ▁can ▁be ▁adjust ed ▁to ▁the ▁level ▁that ▁the ▁dog ▁requires , ▁as ▁situations ▁change . ▁ ▁E - coll ars ▁are ▁sometimes ▁referred ▁to ▁as ▁deliver ing ▁a ▁" static ▁shock "; ▁however , ▁static ▁electric ity ▁is ▁direct ▁current ▁and ▁car ries ▁little ▁energy ▁( order ▁of ▁mill ij ou les ). ▁E - coll ars ▁make ▁use ▁of ▁altern ating ▁current . ▁It ▁is ▁therefore ▁in app ropri ate ▁to ▁refer ▁to ▁e - coll ars ▁coll ars ▁as ▁deliver ing ▁a ▁static ▁shock . ▁ ▁Cons istent ▁stim ulation ▁requires ▁good ▁contact ▁between ▁the ▁col lar ▁electro des ▁and ▁the ▁dog ' s