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  2. Johnson–Nyquist noise - Wikipedia

    en.wikipedia.org/wiki/Johnson–Nyquist_noise

    In this sense, the Johnson noise of an RC circuit can be seen to be inherent, an effect of the thermodynamic distribution of the number of electrons on the capacitor, even without the involvement of a resistor. The noise is not caused by the capacitor itself, but by the thermodynamic fluctuations of the amount of charge on the capacitor.

  3. Noise (electronics) - Wikipedia

    en.wikipedia.org/wiki/Noise_(electronics)

    Different types of noise are generated by different devices and different processes. Thermal noise is unavoidable at non-zero temperature (see fluctuation-dissipation theorem), while other types depend mostly on device type (such as shot noise, [1] [3] which needs a steep potential barrier) or manufacturing quality and semiconductor defects, such as conductance fluctuations, including 1/f noise.

  4. Noise reduction - Wikipedia

    en.wikipedia.org/wiki/Noise_reduction

    Noise reduction is the process of removing noise from a signal. Noise reduction techniques exist for audio and images. Noise reduction algorithms may distort the signal to some degree. Noise rejection is the ability of a circuit to isolate an undesired signal component from the desired signal component, as with common-mode rejection ratio.

  5. Oscillator phase noise - Wikipedia

    en.wikipedia.org/wiki/Oscillator_Phase_Noise

    The more phase noise, broader the linewidth (the higher the corner frequency), and the lower signal amplitude within the linewidth. This happens because the phase noise does not affect the total power in the signal, it only affects its distribution. Without noise, S v (f) is a series of impulse functions at the harmonics of the oscillation ...

  6. Thermostat - Wikipedia

    en.wikipedia.org/wiki/Thermostat

    A thermostat exerts control by switching heating or cooling devices on or off, or by regulating the flow of a heat transfer fluid as needed, to maintain the correct temperature. A thermostat can often be the main control unit for a heating or cooling system, in applications ranging from ambient air control to automotive coolant control.

  7. Fact check: Does setting my thermostat at 68 degrees ... - AOL

    www.aol.com/fact-check-does-setting-thermostat...

    According to the U.S. Department of Energy, people can save up to 10% per year on heating and cooling expenses by dialing their thermostat back eight hours a day from its normal setting, between 7 ...

  8. Does setting your thermostat at 78 degrees really help? We ...

    www.aol.com/news/does-setting-thermostat-78...

    The longest request was issued during the 2011 heat wave, lasting eight days between Aug. 1 and 28. Some cases require localized conservation to balance available supply and customer demand.

  9. Atmospheric refraction - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_refraction

    Diagram showing displacement of the Sun's image at sunrise and sunset Comparison of inferior and superior mirages due to differing air refractive indices, n. Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height. [1]

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