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  2. Water supply and sanitation in Ghana - Wikipedia

    en.wikipedia.org/wiki/Water_supply_and...

    The water supply and sanitation sector in Ghana is a sector that is in charge of the supply of healthy water and also improves the sanitation of water bodies in the country. In Ghana, the drinking water supply and sanitation sectors face a number of issues, including relatively limited sanitation access, intermittent supply, significant water ...

  3. 4K resolution - Wikipedia

    en.wikipedia.org/wiki/4K_resolution

    4K resolution refers to a horizontal display resolution of approximately 4,000 pixels. [1] Digital television and digital cinematography commonly use several different 4K resolutions. In television and consumer media, 3840 × 2160 (4K UHD) with a 16:9 aspect ratio is the dominant 4K standard, whereas the movie projection industry uses 4096 × ...

  4. Computer fan control - Wikipedia

    en.wikipedia.org/wiki/Computer_fan_control

    The control signal is a square wave operating at 25 kHz, with the duty cycle determining the fan speed. 25 kHz is used to raise the sound of the signal above the range of human hearing; use of a lower frequency could produce an audible hum or whine. Typically a fan can be driven between about 30% and 100% of the rated fan speed, using a signal ...

  5. Signing Off - Wikipedia

    en.wikipedia.org/wiki/Signing_Off

    Signing Off is the debut album by British reggae band UB40, released in the UK on 29 August 1980 by Dudley-based independent label Graduate Records.It was an immediate success in their home country, reaching number 2 on the UK albums chart, and made UB40 one of the many popular reggae bands in Britain, several years before the band found international fame.

  6. Energy Star - Wikipedia

    en.wikipedia.org/wiki/Energy_Star

    Energy Star (trademarked ENERGY STAR) is a program run by the U.S. Environmental Protection Agency (EPA) and U.S. Department of Energy (DOE) that promotes energy efficiency. [4] The program provides information on the energy consumption of products and devices using different standardized methods. The Energy Star label [5] is found on more than ...

  7. Pulse-width modulation - Wikipedia

    en.wikipedia.org/wiki/Pulse-width_modulation

    When a digital signal spends more time in the on state than the off state, it has a duty cycle of >50%. When a digital signal spends more time in the off state than the on state, it has a duty cycle of <50%. Here is a pictorial that illustrates these three scenarios: History. The Corliss steam engine was patented in 1849. It used pulse-width ...