After electricity is applied, the hydrogen and oxygen atoms in the water molecules gain enough energy, so that the combination between them becomes unstable and begins to decompose after reaching a limit superior.
This process, water molecules absorb electrical energy and convert it into chemical energy between hydrogen and oxygen (burning hydrogen and oxygen can release a lot of heat)
The energy source of hydroelectricity is not only solar radiation. Hydropower is the use of water energy to generate electricity, and water energy mainly comes from the water cycle on earth. The water cycle refers to the continuous circulation of water between the ocean, land and atmosphere.
Solar radiation plays a key role in the water cycle, warming the Earth's surface, causing water to evaporate and riseeated in the atmosphere to form clouds and precipitation. This solar energy is absorbed by the surface and converted into thermal energy, causing the temperature in local areas to increase and the atmospheric pressure to drop, thus forming wind.
However, the hydraulic energy used by hydroelectric power plants is mainly converted from gravitational potential energy and kinetic energy. When water from high places flows to low places due to gravity, gravitational potential energy is converted into kinetic energy. In a hydraulic turbine, this kinetic energy is converted into rotational mechanical energy, which in turn drives a generator to produce electrical energy.
Thus, although solar radiation is an important driver of the water cycle on Earth, it does not constitute a direct source of energy for hydroelectricity.