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  2. Robotic vacuum cleaner - Wikipedia

    en.wikipedia.org/wiki/Robotic_vacuum_cleaner

    Robotic vacuum cleaner on a hardwood floor. A robotic vacuum cleaner, sometimes called a robovac or a roomba as a generic trademark, is an autonomous robotic vacuum cleaner which has a limited vacuum floor cleaning system combined with sensors and robotic drives with programmable controllers and cleaning routines.

  3. Mechanically powered flashlight - Wikipedia

    en.wikipedia.org/.../Mechanically_powered_flashlight

    Shaking the unit for 10 to 15 seconds every 2 or 3 minutes as necessary permits the device to be used continuously. It is often viewed as a toy, or an emergency backup for other flashlights. [3] Fraudulent counterfeit versions of these flashlights have been sold, most of which incorporate hidden coin-sized non-rechargeable lithium batteries ...

  4. Lithium iron phosphate battery - Wikipedia

    en.wikipedia.org/wiki/Lithium_iron_phosphate_battery

    This busbar is rated for 700 amps DC to accommodate the high currents generated in this 48 volt DC system. Lithium iron phosphate modules, each 700 Ah, 3.25 V. Two modules are wired in parallel to create a single 3.25 V 1400 Ah battery pack with a capacity of 4.55 kWh. Cell voltage Minimum discharge voltage = 2.0-2.8 V [27] [28] [29]

  5. Eveready Battery Company - Wikipedia

    en.wikipedia.org/wiki/Eveready_Battery_Company

    From 1917 until 1921, Eveready used the trademark "DAYLO" for their flashlights and on their batteries. Into the 1930s, it sold "A," "B," and "C" radio batteries, Columbia Dry Batteries, and flashlight batteries. [12] B batteries were sold under the Layerbilt name. [13] In 1937, a South African operation was established in Port Elizabeth. [14]

  6. Flashlight - Wikipedia

    en.wikipedia.org/wiki/Flashlight

    The original 1890s flashlights used a metal ring around the fiber body of the flashlight as one contact of a switch; the second contact was a movable metal loop that could be flipped down to touch the ring, completing the circuit. A wide variety of mechanical switch designs using slide switches, rocker switches, or side-mounted or end-mounted ...

  7. Troubleshooting - Wikipedia

    en.wikipedia.org/wiki/Troubleshooting

    Troubleshooting is a form of problem solving, often applied to repair failed products or processes on a machine or a system. It is a logical, systematic search for the source of a problem in order to solve it, and make the product or process operational again. Troubleshooting is needed to identify the symptoms.

  8. Rechargeable battery - Wikipedia

    en.wikipedia.org/wiki/Rechargeable_battery

    In lithium-ion types, especially on deep discharge, some reactive lithium metal can be formed on charging, which is no longer available to participate in the next discharge cycle. Sealed batteries may lose moisture from their liquid electrolyte, especially if overcharged or operated at high temperature.

  9. Flash (photography) - Wikipedia

    en.wikipedia.org/wiki/Flash_(photography)

    Flash intensity is typically measured in stops or in fractions (1, 1 ⁄ 2, 1 ⁄ 4, 1 ⁄ 8 etc.). Some monolights display an "EV Number", so that a photographer can know the difference in brightness between different flash units with different watt-second ratings. EV10.0 is defined as 6400 watt-seconds, and EV9.0 is one stop lower, i.e. 3200 ...

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