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  2. Auto-defrost - Wikipedia

    en.wikipedia.org/wiki/Auto-defrost

    A defrost timer taken out of a household refrigerator. The defrost mechanism in a refrigerator heats the cooling element (evaporator coil) for a short period of time and melts the frost that has formed on it. [1] The resulting water drains through a duct at the back of the unit. Defrosting is controlled by an electric or electronic timer.

  3. Refrigerator - Wikipedia

    en.wikipedia.org/wiki/Refrigerator

    In cheaper and/or older models, a defrost cycle is controlled via a mechanical timer. This timer is set to shut off the compressor and fan and energize a heating element located near or around the evaporator for about 15 to 30 minutes at every 6 to 12 hours. This melts any frost or ice build-up and allows the refrigerator to work normally once ...

  4. Thermal cutoff - Wikipedia

    en.wikipedia.org/wiki/Thermal_cutoff

    Two thermal switches (Thermal Cut) Schematic symbol for a thermal overload switch A thermal switch (sometimes thermal reset or thermal cutout (TCO)) is a device which normally opens at a high temperature (often with a faint "plink" sound) and re-closes when the temperature drops.

  5. Microwave oven - Wikipedia

    en.wikipedia.org/wiki/Microwave_oven

    While prices remained high, new features continued to be added to home models. Amana introduced automatic defrost in 1974 on their RR-4D model, and was the first to offer a microprocessor controlled digital control panel in 1975 with their RR-6 model. 1974 Radarange RR-4. By the late 1970s, technological advances led to rapidly falling prices.

  6. Dashpot timer - Wikipedia

    en.wikipedia.org/wiki/Dashpot_timer

    The dashpot timer, or mechanical timer, has changed the way we use technology. With its many industrial and commercial applications, to household appliances and gardening, the dashpot timer is a very important invention that has certainly led to many changes in how thing were done during the 20th century and how things are done in modern times.

  7. Motor capacitor - Wikipedia

    en.wikipedia.org/wiki/Motor_capacitor

    When a motor is running during a lightning strike on the power grid, the run capacitor may be damaged or weakened by a voltage spike, thus requiring replacement. IEC/EN 60252-1 2011 specifies the following levels of protection for motor run capacitors: S0 – no protection; S1, S2 – fail open-circuit or short-circuit; S3 – fail open-circuit ...

  8. Timeline of General Electric - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_General_Electric

    GE Oil & Gas acquires Vetco Gray for US$1.9 billion. [19] [20] 2007 GE Plastics is sold to SABIC for US$11.6 billion. [21] 2008 GE Oil & Gas acquires Hydril Pressure & Control for US$1.12 billion from Tenaris, who retains possession of Hydril Premium Connections. [22] [23] 2008 GE Co. acquires Vital Signs Inc. for US$860 million [24] 2009

  9. Bald eagle - Wikipedia

    en.wikipedia.org/wiki/Bald_Eagle

    The bald eagle is placed in the genus Haliaeetus (), and gets both its common and specific scientific names from the distinctive appearance of the adult's head. Bald in the English name is from an older usage meaning "having white on the face or head" rather than "hairless", referring to the white head feathers contrasting with the darker body. [4]

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