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  2. Electromagnetic door holder - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_door_holder

    A simple electromagnetic door holder consists of a strong electromagnet, usually attached to a wall or mounted in a floor pedestal enclosure, next to the door it controls. The mechanism may be mounted near the floor, at the upper corner of the open door, or at any convenient height along the latch edge (away from the hinged edge).

  3. Circuit diagram - Wikipedia

    en.wikipedia.org/wiki/Circuit_diagram

    A circuit diagram (or: wiring diagram, electrical diagram, elementary diagram, electronic schematic) is a graphical representation of an electrical circuit. A pictorial circuit diagram uses simple images of components, while a schematic diagram shows the components and interconnections of the circuit using standardized symbolic representations.

  4. Electromagnetic lock - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_lock

    The principle behind an electromagnetic lock is the use of electromagnetism to lock a door when energized. The holding force should be collinear with the load, and the lock and armature plate should be face-to-face to achieve optimal operation. The magnetic lock relies upon some of the basic concepts of electromagnetism.

  5. Keycard lock - Wikipedia

    en.wikipedia.org/wiki/Keycard_lock

    There were 32 positions for possible hole locations, giving approximately 4.3 billion different keys. The key could easily be changed for each new guest by inserting a new key template in the lock that matched the new key. [2] In the early 1980s, the key card lock was electrified with LEDs that detected the holes. A keycard with a magnetic stripe

  6. Security alarm - Wikipedia

    en.wikipedia.org/wiki/Security_alarm

    Wireless home alarm system control panel A house alarm. A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school. Security alarms protect against burglary or property damage, as well as against intruders.

  7. Michael Bolton wishes for 'health, happiness' in 2025, 1 year ...

    www.aol.com/michael-bolton-wishes-health...

    Michael Bolton and his family were in good spirits over the holidays, one year after his brain tumor diagnosis.. The Grammy-winning singer shared a photo of himself in a Santa hat on his Facebook ...

  8. Magnetic circuit - Wikipedia

    en.wikipedia.org/wiki/Magnetic_circuit

    Magnetic field (green) induced by a current-carrying wire winding (red) in a magnetic circuit consisting of an iron core C forming a closed loop with two air gaps G in it. In an analogy to an electric circuit, the winding acts analogously to an electric battery, providing the magnetizing field , the core pieces act like wires, and the gaps G act like resistors.

  9. Espresso Martini Fudge Is Cocktail Hour Bite-Sized - AOL

    www.aol.com/espresso-martini-fudge-cocktail-hour...

    Yields: 36. Prep Time: 10 mins. Total Time: 2 hours 25 mins. Ingredients. Bottom Layer. Cooking spray. 1 c. (170 g.) semisweet chocolate chips. 3/4 c. sweetened ...