When electric current is passed through acidulated water, it splits into hydrogen and oxygen. This effect of electric current is called

When electric current is passed through acidulated water, it splits into hydrogen and oxygen. This effect of electric current is called chemical effect. 
When an electric current is passed through such a solution, the positive ions ($H^{+}$) migrate towards the negative terminal, and the negative ions ($O{H}^{-}$) will migrate towards the positive terminal. On negative and positive terminals, they lose or gain electrons, respectively, from neutral elements. Thus, a chemical effect takes place.