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  2. Metal detector - Wikipedia

    en.wikipedia.org/wiki/Metal_detector

    U.S. Army soldiers use a military standard metal detector. A metal detector is an instrument that detects the nearby presence of metal.Metal detectors are useful for finding metal objects on the surface, underground, and under water.

  3. Surveying - Wikipedia

    en.wikipedia.org/wiki/Surveying

    A surveyor using a total station A student using a theodolite in field. Surveying or land surveying is the technique, profession, art, and science of determining the terrestrial two-dimensional or three-dimensional positions of points and the distances and angles between them.

  4. Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/Main_Page

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us

  5. Proportional–integral–derivative controller - Wikipedia

    en.wikipedia.org/wiki/Proportional–integral...

    In the standard form of the equation (see later in article), and are respectively replaced by / and ; the advantage of this being that and have some understandable physical meaning, as they represent an integration time and a derivative time respectively.

  6. Parallel ATA - Wikipedia

    en.wikipedia.org/wiki/Parallel_ATA

    Parallel ATA (PATA), originally AT Attachment, also known as Integrated Drive Electronics (IDE), is a standard interface designed for IBM PC-compatible computers.It was first developed by Western Digital and Compaq in 1986 for compatible hard drives and CD or DVD drives.

  7. Information and communications technology - Wikipedia

    en.wikipedia.org/wiki/Information_and...

    Information and communications technology (ICT) is an extensional term for information technology (IT) that stresses the role of unified communications [1] and the integration of telecommunications (telephone lines and wireless signals) and computers, as well as necessary enterprise software, middleware, storage and audiovisual, that enable users to access, store, transmit, understand and ...

  8. Capacitor - Wikipedia

    en.wikipedia.org/wiki/Capacitor

    In electrical engineering, a capacitor is a device that stores electrical energy by accumulating electric charges on two closely spaced surfaces that are insulated from each other.

  9. Oscilloscope - Wikipedia

    en.wikipedia.org/wiki/Oscilloscope

    Early high-speed visualisations of electrical voltages were made with an electro-mechanical oscillograph, [2] [3] invented by André Blondel in 1893. These gave valuable insights into high speed voltage changes, but had a frequency response in single kHz, and were superseded by the oscilloscope which used a cathode-ray tube (CRT) as its display element.