What analogy shows how energy is like water?

Energy is often likened to water in that both can flow, change forms, and be stored. Just as water can be contained in a reservoir for later use, energy can be stored in batteries or other systems. Additionally, both can be harnessed to do work—water can turn turbines to generate electricity, while energy can power machines and devices. Finally, the movement of both can be influenced by external factors, such as gravity for water and electrical potential for energy.