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  2. Passive sign convention - Wikipedia

    en.wikipedia.org/wiki/Passive_sign_convention

    Illustration of the "reference directions" of the current (), voltage (), and power () variables used in the passive sign convention.If positive current is defined as flowing into the device terminal which is defined to be positive voltage, then positive power (big arrow) given by the equation = represents electric power flowing into the device, and negative power represents power flowing out.

  3. Article 4 direction - Wikipedia

    en.wikipedia.org/wiki/Article_4_Direction

    An Article 4 direction is made by a local planning authority in the United Kingdom and exceptionally may be subject to intervention by the government. It serves to restrict permitted development rights, which means that a lot of the things people do to their land or houses without planning permission and often take for granted, are brought into the realms of planning consent.

  4. Portal:Energy/Selected article/4 - Wikipedia

    en.wikipedia.org/.../Selected_article/4

    Mostly thanks to the Sun, the world also has a renewable usable energy flux that exceeds 120 PW (8,000 times 2004 total energy usage), or 3.8 YJ/yr, dwarfing all non-renewable resources. Despite the abundance of fossil fuels there are a number of pressures that may move the world’s energy consumption to alternative energy sources.

  5. Second law of thermodynamics - Wikipedia

    en.wikipedia.org/wiki/Second_law_of_thermodynamics

    The energy and entropy of unpolarized blackbody thermal radiation, is calculated using the spectral energy and entropy radiance expressions derived by Max Planck [63] using equilibrium statistical mechanics, = ⁡ (), = ((+) ⁡ (+) ⁡ ()) where c is the speed of light, k is the Boltzmann constant, h is the Planck constant, ν is frequency ...

  6. Isotropic radiator - Wikipedia

    en.wikipedia.org/wiki/Isotropic_radiator

    If (,) is the antenna's aperture, the amount of power in the frequency range the antenna receives from an increment of solid angle = in the direction , is (,) = (,) = (,) To find the total power in the frequency range the antenna receives, this is integrated over all directions (a solid angle of ) = (,) Since the antenna is isotropic, it has ...

  7. Electromagnetic four-potential - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_four-potential

    These homogeneous solutions in general represent waves propagating from sources outside the boundary. When the integrals above are evaluated for typical cases, e.g. of an oscillating current (or charge), they are found to give both a magnetic field component varying according to r −2 (the induction field ) and a component decreasing as r −1 ...

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  9. Low-carbon electricity - Wikipedia

    en.wikipedia.org/wiki/Low-carbon_electricity

    Wind power is considered a sustainable, renewable energy source, and has a much smaller impact on the environment compared to burning fossil fuels. Wind power is variable, so it needs energy storage or other dispatchable generation energy sources to attain a reliable supply of electricity. Land-based (onshore) wind farms have a greater visual ...