energias

Energias, or energies, is a broad term used to describe the different forms of energy and the resources used to power human activities. In physics, energy is the property of a system that enables it to perform work. It is a scalar quantity, conserved in isolated systems, and it can be transformed from one form to another without being created or destroyed, a principle known as the conservation of energy.

Common forms include kinetic energy, potential energy, thermal energy, chemical energy, electrical energy, radiant (electromagnetic) energy, and nuclear energy. Energy can be stored, transferred, or converted by engines, turbines, chemical reactions, and electrical devices. Electricity is the most versatile energy carrier, while heat is a primary energy form in many industrial processes.

Energy resources are typically categorized as renewable or non-renewable. Renewable energies include solar, wind, hydro, geothermal, and biomass, which can be replenished on human time scales. Non-renewable energies include fossil fuels (coal, oil, natural gas) and, for some purposes, uranium used in nuclear power. The mix of energy sources varies by region and affects cost, reliability, and environmental impact.

Measurements use joules or kilowatt-hours. Energy efficiency and energy intensity describe how effectively energy is used and how much is required to produce goods and services. Addressing energias involves balancing access, affordability, reliability, and sustainability, while mitigating emissions and environmental effects.