what is the primary source of energy

The primary source of energy comes from various sources, including nuclear energy, fossil energy such as oil, coal, and natural gas, and renewable sources like wind, solar, geothermal, and hydropower. The primary energy source on Earths surface is sunlight, which can be harnessed in several ways. The sun is the original source of almost all the energy on Earth, and solar heat energy from the sun can be used to produce electricity from solar cells. Wind energy is also a form of solar energy, as the sun heats the Earth's surface, and the Earth heats the air above it, causing wind. Fossil fuels, including coal, oil, and natural gas, are also primary energy sources. It's important to note that electricity is not a primary energy source, but a secondary energy source that is generated from primary energy sources.