Can an electric current be produced from two dissimilar metal plates immersed in water?

The production of electric current from two dissimilar metal plates immersed in water is based on the principles of electrochemistry and ion conductivity. When two different metals are placed in a solution, a potential difference can be created due to their differing electrode potentials. This difference causes electrons to flow from one metal to the other, thereby generating an electric current.

This phenomenon occurs under certain conditions, which is why "sometimes" is the correct answer. For electric current to be produced, the water must contain ions that can facilitate conductivity, such as in tap water or saltwater. Distilled water, on the other hand, has a low concentration of ions, making it a poor conductor and less likely to support current flow. Therefore, while it is possible to generate an electric current, it is not guaranteed in every scenario or type of water, such as when using distilled water or if the metals are not sufficiently dissimilar. The presence of ions and the specific properties of the metals involved are critical factors in determining whether a current will be produced.