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  2. Primary energy - Wikipedia

    en.wikipedia.org/wiki/Primary_energy

    Primary energy (PE) is the energy found in nature that has not been subjected to any human engineered conversion process.It encompasses energy contained in raw fuels and other forms of energy, including waste, received as input to a system.

  3. Helmholtz free energy - Wikipedia

    en.wikipedia.org/wiki/Helmholtz_free_energy

    The Helmholtz free energy is defined as [3], where . F is the Helmholtz free energy (sometimes also called A, particularly in the field of chemistry) (SI: joules, CGS: ergs),; U is the internal energy of the system (SI: joules, CGS: ergs),

  4. Potential energy - Wikipedia

    en.wikipedia.org/wiki/Potential_energy

    There are various types of potential energy, each associated with a particular type of force. For example, the work of an elastic force is called elastic potential energy; work of the gravitational force is called gravitational potential energy; work of the Coulomb force is called electric potential energy; work of the strong nuclear force or weak nuclear force acting on the baryon charge is ...

  5. Energy density - Wikipedia

    en.wikipedia.org/wiki/Energy_density

    When discussing the chemical energy contained, there are different types which can be quantified depending on the intended purpose. One is the theoretical total amount of thermodynamic work that can be derived from a system, at a given temperature and pressure imposed by the surroundings, called exergy.

  6. Latent heat - Wikipedia

    en.wikipedia.org/wiki/Latent_heat

    Latent heat (also known as latent energy or heat of transformation) is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process—usually a first-order phase transition, like melting or condensation.

  7. Physics - Wikipedia

    en.wikipedia.org/wiki/Physics

    Physics is the scientific study of matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. [1] ...

  8. Renewable energy - Wikipedia

    en.wikipedia.org/wiki/Renewable_energy

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  9. Energy in Indonesia - Wikipedia

    en.wikipedia.org/wiki/Energy_in_Indonesia

    PT Medco Energi International, the largest publicly listed oil and gas company in Indonesia; Adaro Energy, one of the largest coal mining companies in Indonesia; Foreign firms. US-based firm PT Chevron Pacific Indonesia is the largest producer of crude oil in Indonesia; Chevron produces (2014) around 40% of the crude oil in Indonesia