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  2. Energy conversion efficiency - Wikipedia

    en.wikipedia.org/wiki/Energy_conversion_efficiency

    Unlike efficacy (effectiveness), which is a unit of measurement, efficiency is a unitless number expressed as a percentage, requiring only that the input and output units be of the same type. The luminous efficiency of a light source is thus the percentage of luminous efficacy per theoretical maximum efficacy at a specific wavelength.

  3. Efficiency - Wikipedia

    en.wikipedia.org/wiki/Efficiency

    Efficiency is the often measurable ability to avoid making mistakes or wasting materials, energy, efforts, money, and time while performing a task. In a more general sense, it is the ability to do things well, successfully, and without waste.

  4. Glossary of physics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_physics

    A branch of physics that studies atoms as isolated systems of electrons and an atomic nucleus. Compare nuclear physics. atomic structure atomic weight (A) The sum total of protons (or electrons) and neutrons within an atom. audio frequency A periodic vibration whose frequency is in the band audible to the average human, the human hearing range.

  5. Effectiveness - Wikipedia

    en.wikipedia.org/wiki/Effectiveness

    In physics, an effective theory is, similar to a phenomenological theory, a framework intended to explain certain (observed) effects without the claim that the theory correctly models the underlying (unobserved) processes. In heat transfer, effectiveness is a measure of the performance of a heat exchanger when using the NTU method.

  6. Efficiency (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Efficiency_(disambiguation)

    Efficiency is the extent to which time or effort is well used for the intended task or purpose. Efficiency may also refer to: Efficiency (aerodynamics), the amount of lift divided by the aerodynamic drag; Efficiency (apartment), a one-room apartment; Efficiency (basketball), a statistical benchmark to compare the overall value of players

  7. Energy - Wikipedia

    en.wikipedia.org/wiki/Energy

    This law is a fundamental principle of physics. As shown rigorously by Noether's theorem , the conservation of energy is a mathematical consequence of translational symmetry of time, [ 17 ] a property of most phenomena below the cosmic scale that makes them independent of their locations on the time coordinate.

  8. Energy transformation - Wikipedia

    en.wikipedia.org/wiki/Energy_transformation

    In physics, energy is a quantity that provides the capacity to perform work (e.g. lifting an object) or provides heat. In addition to being converted, according to the law of conservation of energy, energy is transferable to a different location or object, but it cannot be created or destroyed.

  9. Energy efficiency - Wikipedia

    en.wikipedia.org/wiki/Energy_efficiency

    Energy efficiency may refer to: Energy efficiency (physics), the ratio between the useful output and input of an energy conversion process Electrical efficiency, useful power output per electrical power consumed; Mechanical efficiency, a ratio of the measured performance to the performance of an ideal machine