What is true regarding galvanic current production?

Galvanic current production involves the generation of direct current (DC) through electrochemical means, often utilizing chemical reactions in a solution. This type of current can indeed be produced from various sources, including chemical cells like dry cells, which generate current through chemical reactions without the need for direct electrical mains.

The assertion that galvanic current can only be obtained from electrical mains is incorrect because galvanic currents can be produced independently of the mains electricity supply. Therefore, while a dry cell can produce galvanic current, it does not rely on electrical mains for its operation.

Recognizing these facts helps clarify the understanding of galvanic currents, specifically how they can be generated and the various sources that can produce them. A clear distinction exists between the limitations of electrical mains-based power and alternative sources such as dry cells, which can also provide galvanic current.