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  2. Electrocardiography - Wikipedia

    en.wikipedia.org/wiki/Electrocardiography

    Among other things, an ECG can be used to measure the rate and rhythm of heartbeats, the size and position of the heart chambers, the presence of any damage to the heart's muscle cells or conduction system, the effects of heart drugs, and the function of implanted pacemakers.

  3. P wave (electrocardiography) - Wikipedia

    en.wikipedia.org/wiki/P_wave_(electrocardiography)

    The P wave is a summation wave generated by the depolarization front as it transits the atria. Normally the right atrium depolarizes slightly earlier than left atrium since the depolarization wave originates in the sinoatrial node, in the high right atrium and then travels to and through the left atrium.

  4. Electrical Guitar Company - Wikipedia

    en.wikipedia.org/wiki/Electrical_Guitar_Company

    The Electrical Guitar Company (also EGC) is a United States–based manufacturer of all-aluminium and aluminium-neck electric guitars and bass guitars.Operated by machinist and luthier Kevin Burkett, it produces limited run and custom designed instruments.

  5. Battery nomenclature - Wikipedia

    en.wikipedia.org/wiki/Battery_nomenclature

    A zinc-carbon lantern battery, consisting of 4 round "size 25" cells in series. Terminated with spring terminals. 4LR25-2: 4: L: R: 25: 2: An alkaline lantern battery, consisting of 2 parallel strings of 4 round "size 25" cells in series 6F22: 6: F: 22: A zinc-carbon rectangular battery, consisting of 6 flat "size 22" cells. Equivalent to a PP3 ...

  6. QT interval - Wikipedia

    en.wikipedia.org/wiki/QT_interval

    The QT interval is a measurement made on an electrocardiogram used to assess some of the electrical properties of the heart.It is calculated as the time from the start of the Q wave to the end of the T wave, and approximates to the time taken from when the cardiac ventricles start to contract to when they finish relaxing.

  7. Electronic navigational chart - Wikipedia

    en.wikipedia.org/wiki/Electronic_navigational_chart

    An Electronic Navigational Chart (ENC) is a digital representation of a real-world geographical area for the purpose of Marine navigation.Real-world objects and areas of navigational significance, or to a lesser degree - informational significance, are portrayed through Raster facsimiles of traditional paper charts; or more commonly through vector images, which are able to scale their relative ...

  8. List of battery sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_sizes

    A common size for cells inside cordless tool battery packs. This size is also used in radio-controlled scale vehicle battery packs and some Soviet multimeters. 1 ⁄ 2-, 4 ⁄ 5 - and 5 ⁄ 4-sub-C sizes (differing in length) are also available. Soviet 332 type can be replaced with R10 (#4, 927, BF, U8) or 1.5 V elements from 3 V 2xLR10 packs ...

  9. Chicken egg sizes - Wikipedia

    en.wikipedia.org/wiki/Chicken_egg_sizes

    Size Pack weight (12 eggs) Mass range per egg Average mass per egg Edible portion per egg King-size 860 g 71.7 g – 78.5 g 73 g 64 g Jumbo 800 g 66.7 g – 71.6 g 68 g 59 g Extra-Large 700 g 58.3 g – 66.6 g 60 g 52 g Large 600 g 50.0 g – 58.2 g 52 g 45 g Medium 500 g 41.7 g – 49.9 g 43 g 37 g