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  2. Intensity (physics) - Wikipedia

    en.wikipedia.org/wiki/Intensity_(physics)

    Intensity (physics) In physics and many other areas of science and engineering the intensity or flux of radiant energy is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of the energy. [a] In the SI system, it has units watts per square metre (W/m 2 ), or kg ⋅ s −3 ...

  3. Poynting vector - Wikipedia

    en.wikipedia.org/wiki/Poynting_vector

    v. t. e. In physics, the Poynting vector (or Umov–Poynting vector) represents the directional energy flux (the energy transfer per unit area, per unit time) or power flow of an electromagnetic field. The SI unit of the Poynting vector is the watt per square metre (W/m 2 ); kg/s 3 in base SI units.

  4. Maximum power point tracking - Wikipedia

    en.wikipedia.org/wiki/Maximum_power_point_tracking

    Maximum power point tracking ( MPPT ), [1] [2] or sometimes just power point tracking ( PPT ), [3] [4] is a technique used with variable power sources to maximize energy extraction as conditions vary [5]. The technique is most commonly used with photovoltaic (PV) solar systems but can also be used with wind turbines, optical power transmission ...

  5. Inverse-square law - Wikipedia

    en.wikipedia.org/wiki/Inverse-square_law

    In science, an inverse-square law is any scientific law stating that the observed "intensity" of a specified physical quantity is inversely proportional to the square of the distance from the source of that physical quantity. The fundamental cause for this can be understood as geometric dilution corresponding to point-source radiation into ...

  6. Power (physics) - Wikipedia

    en.wikipedia.org/wiki/Power_(physics)

    Power in mechanical systems is the combination of forces and movement. In particular, power is the product of a force on an object and the object's velocity, or the product of a torque on a shaft and the shaft's angular velocity. Mechanical power is also described as the time derivative of work.

  7. Spectral density - Wikipedia

    en.wikipedia.org/wiki/Spectral_density

    The spectral density of a fluorescent light as a function of optical wavelength shows peaks at atomic transitions, indicated by the numbered arrows. The voice waveform over time (left) has a broad audio power spectrum (right). In signal processing, the power spectrum of a continuous time signal describes the distribution of power into frequency ...

  8. Arias intensity - Wikipedia

    en.wikipedia.org/wiki/Arias_Intensity

    Arias intensity. The Arias intensity ( IA) is a measure of the strength of a ground motion. [1] It determines the intensity of shaking by measuring the acceleration of transient seismic waves. It has been found to be a fairly reliable parameter to describe earthquake shaking necessary to trigger landslides. [2]

  9. Photometry (optics) - Wikipedia

    en.wikipedia.org/wiki/Photometry_(optics)

    Photometry is a branch of optics that deals with the measurement of light in terms of its perceived brightness to the human eye. [1] It is concerned with quantifying the amount of light that is emitted, transmitted, or received by an object or a system. In modern photometry, the radiant power at each wavelength is weighted by a luminosity ...

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