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  2. Refrigerator - Wikipedia

    en.wikipedia.org/wiki/Refrigerator

    Food in a refrigerator with its door open. A refrigerator, commonly shortened to fridge, is a commercial and home appliance consisting of a thermally insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat from its inside to its external environment so that its inside is cooled to a temperature below the room temperature. [1]

  3. Refrigeration - Wikipedia

    en.wikipedia.org/wiki/Refrigeration

    In 1867, in San Antonio, Texas, a French immigrant named Andrew Muhl built an ice-making machine to help service the expanding beef industry before moving it to Waco in 1871. In 1873, the patent for this machine was contracted by the Columbus Iron Works, a company acquired by the W.C. Bradley Co., which went on to produce the first commercial ...

  4. Home appliance - Wikipedia

    en.wikipedia.org/wiki/Home_appliance

    Major appliances, often called white goods, include items like refrigerators and washing machines, while small appliances encompass items such as toasters and coffee makers. [6] Product design shifted in the 1960s, embracing new materials and colors. Consumer electronics, often referred to as brown goods, include items like TVs and computers. [7]

  5. L pad - Wikipedia

    en.wikipedia.org/wiki/L_pad

    An L pad used to match a source to a load of a different impedance. If a source and load are both resistive (i.e. Z1 and Z2 have zero or very small imaginary part) then a resistive L pad can be used to match them to each other. As shown, either side of the L pad can be the source or load, but the Z1 side must be the side with the higher ...

  6. Level (logarithmic quantity) - Wikipedia

    en.wikipedia.org/wiki/Level_(logarithmic_quantity)

    In science and engineering, a power level and a field level (also called a root-power level) are logarithmic magnitudes of certain quantities referenced to a standard reference value of the same type. A power level is a logarithmic quantity used to measure power, power density or sometimes energy, with commonly used unit decibel (dB).

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