When an electric current passes through the water, gas bubbles appear on the surface of the plates. Passing an electric current through the water decomposes the water into hydrogen and oxygen gases. In water, some salts dissociate into nones and salt solutions begin to conduct electric current. In this case, nones of substances settle on the electrodes. For example, if an electric current flows through copper sulfate, then copper will settle on the negative elecrode, and the sulfuric acid residue SO4 will settle on the positive one.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.