The word "energy" was rarely mentioned in the past, and it was the two oil crises that made it a hot topic of discussion. Energy is the most basic driving force for the development and economic growth of the whole world and the foundation of human survival. Since the industrial revolution, energy security has emerged. With the rapid development of global economy, international energy security has risen to the national level, and all countries have formulated energy policies with energy supply security as the core. In the following two decades, with the support of stable energy supply, the world economy has achieved tremendous growth. However, while enjoying the benefits of economic development and scientific and technological progress brought by energy, mankind has also encountered a series of inevitable energy security challenges. Energy shortage, resource competition and environmental pollution caused by excessive use of energy threaten the survival and development of mankind.
At present, there are about 20 definitions of energy. For example, the Encyclopedia of Science and Technology says that "energy is a kind of resource, from which energy such as heat, light and power can be obtained"; The Encyclopedia Britannica said: "Energy is a term, which includes all fuels, running water, sunshine and wind, and human beings can use it to provide the energy they need by appropriate means of transformation"; The Japanese Encyclopedia says that "in all kinds of production activities, we use heat energy, mechanical energy, light energy and electric energy to do work, and all kinds of energy that can be used as carriers in nature are called energy"; China's Encyclopedia of Energy says that "energy is an energy carrier resource, which can provide any form of energy needed by human beings directly or through conversion." It can be seen that energy is various forms of energy sources, which can be converted to each other. To be precise and simple, energy is a material resource that can provide some form of energy for human beings in nature.
Energy is also called energy or energy. Refers to all kinds of energy (such as heat, electricity, light and mechanical energy, etc.). ) or a substance that can do work. Refers to all kinds of resources that can obtain useful energy directly or through processing and transformation, including primary energy such as coal, crude oil, natural gas, coalbed methane, hydropower, nuclear energy, wind energy, solar energy, geothermal energy, biomass energy, secondary energy such as electricity, heat and refined oil, and other new and renewable energy.
Energy, also known as energy or energy resources, is a material resource that provides various abilities and motivation for human production and life, and is an important material foundation of the national economy. The future fate of the country depends on the control of energy. The development and effective utilization of energy and per capita consumption are important signs of production technology and living standards.
Energy is a material resource that can provide some form of energy for human beings in nature, including conventional energy such as coal, oil and natural gas, as well as new energy such as wind energy, solar energy and nuclear energy.