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  2. Microwave oven - Wikipedia

    en.wikipedia.org/wiki/Microwave_oven

    Globally. A microwave oven or simply microwave is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. [1] This induces polar molecules in the food to vibrate [2] and produce thermal energy in a process known as dielectric heating. Microwave ovens heat foods quickly and ...

  3. Microwave - Wikipedia

    en.wikipedia.org/wiki/Microwave

    Microwave is a form of electromagnetic radiation with wavelengths shorter than other radio waves ( as originally discovered) but longer than infrared waves. Its wavelength ranges from about one meter to one millimeter, corresponding to frequencies between 300 MHz and 300 GHz, broadly construed.

  4. Wireless power transfer - Wikipedia

    en.wikipedia.org/wiki/Wireless_power_transfer

    When the phone is set on the pad, a coil in the pad creates a magnetic field [1] which induces a current in another coil, in the phone, charging its battery. Wireless power transfer ( WPT ), wireless power transmission, wireless energy transmission ( WET ), or electromagnetic power transfer is the transmission of electrical energy without wires ...

  5. Vacuum tube - Wikipedia

    en.wikipedia.org/wiki/Vacuum_tube

    A vacuum tube, electron tube, [1] [2] [3] valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a hot ...

  6. Samsung Electronics - Wikipedia

    en.wikipedia.org/wiki/Samsung_Electronics

    It is majority-owned by foreign investors. [ 7][ 8] As of 2019, Samsung Electronics is the world's second-largest technology company by revenue, and its market capitalization stood at US$520.65 billion, the 12th largest in the world. [ 9] Samsung is the world's largest manufacturer of smartphones since 2011.

  7. Panasonic - Wikipedia

    en.wikipedia.org/wiki/Panasonic

    Over the next several decades, Matsushita released additional products, including black and white TVs (1952), electrical blenders, fridges (1953), rice cookers (1959), color TVs, and microwave ovens (1966). [33] The company debuted a high-fidelity audio speaker in Japan in 1965 with the brand Technics.

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