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  2. Flywheel energy storage - Wikipedia

    en.wikipedia.org/wiki/Flywheel_energy_storage

    A typical system consists of a flywheel supported by rolling-element bearing connected to a motor–generator. The flywheel and sometimes motor–generator may be enclosed in a vacuum chamber to reduce friction and energy loss. First-generation flywheel energy-storage systems use a large steel flywheel rotating on mechanical bearings.

  3. Lottery wheeling - Wikipedia

    en.wikipedia.org/wiki/Lottery_wheeling

    Lottery Wheels were introduced in the 1970s and have become a popular method of playing. Several "spin off" methods have since become popular, with mixed acceptance. From a mathematical standpoint 'wheeling' has no impact on the expected value of any given ticket. However, playing a lottery wheel impact the win distribution over time.

  4. Water turbine - Wikipedia

    en.wikipedia.org/wiki/Water_turbine

    A water turbine is a rotary machine that converts kinetic energy and potential energy of water into mechanical work. Water turbines were developed in the 19th century and were widely used for industrial power prior to electrical grids. Now, they are mostly used for electric power generation.

  5. Freewheel - Wikipedia

    en.wikipedia.org/wiki/Freewheel

    Ratcheting freewheel mechanism (van Anden, 1869) In mechanical or automotive engineering, a freewheel or overrunning clutch is a device in a transmission that disengages the driveshaft from the driven shaft when the driven shaft rotates faster than the driveshaft. An overdrive is sometimes mistakenly called a freewheel, but is otherwise unrelated.

  6. Water wheel - Wikipedia

    en.wikipedia.org/wiki/Water_wheel

    A stream wheel [6] [12] is a vertically mounted water wheel that is rotated by the water in a water course striking paddles or blades at the bottom of the wheel. This type of water wheel is the oldest type of horizontal axis wheel. [citation needed] They are also known as free surface wheels because the water is not constrained by millraces or ...

  7. Wheel of Fortune (American game show) - Wikipedia

    en.wikipedia.org/wiki/Wheel_of_Fortune_(American...

    The games are all similar, incorporating a wheel, puzzle display board, play money and various accessories like Free Spin tokens. Milton Bradley released the first board game in 1975. In addition to all the supplies mentioned above, the game included 20 prize cards to simulate the "shopping" prizes of the show, with prizes ranging in value from ...

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