Solar energy, wind energy, geothermal energy, ocean energy, etc.
Compared with conventional energy, new energy is obtained by using new technologies and new materials, and is systematically developed and used on the basis of new technologies. Like solar energy, wind energy, ocean energy, geothermal energy, etc. Compared with conventional energy, the new energy production scale is smaller and the scope of use is narrower. The distinction between conventional energies and new energies is relative.
Energy refers to natural resources that can provide energy. It can provide humans with electrical energy, thermal energy, mechanical energy, light energy, sound energy, etc. These energy sources include coal, oil, hydroelectricity, wind energy, solar energyre, atomic energy, hydrogen energy, etc. Energy can be divided into two categories based on its formation conditions:
One category exists in nature and can be developed and obtained using certain technologies without processing to modify its properties and its conversion. . The energy is called primary energy. For example, mined raw coal, crude oil, natural gas, hydroelectric energy, solar energy, wind energy, biomass energy, geothermal energy, tidal energy, ocean energy, etc. are all primary energy sources.
The other type is energy that is processed and converted into another form of primary energy, called secondary energy. Such as electricity, petroleum products, coke, artificial gas, water coal, methanol, ethanol, etc. are all secondary energy sources.
When the primary energy is convWhen used in secondary energy, there will always be conversion losses, but secondary energy has higher terminal use efficiency than primary energy, and is also cleaner and easier to use.
Because sound is energy that has not been processed to change its properties and conversion, it is a primary energy source.