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  2. SD card - Wikipedia

    en.wikipedia.org/wiki/SD_card

    Secure Digital Standard Capacity (SD) logo. The specification defines cards with a capacity of up to 2 GB. The second-generation Secure Digital (SDSC or Secure Digital Standard Capacity) card was developed to improve on the MultiMediaCard (MMC) standard, which continued to evolve, but in a different direction.

  3. Introduction to quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Introduction_to_quantum...

    e. Quantum mechanics is the study of matter and its interactions with energy on the scale of atomic and subatomic particles. By contrast, classical physics explains matter and energy only on a scale familiar to human experience, including the behavior of astronomical bodies such as the moon. Classical physics is still used in much of modern ...

  4. Solid-state electronics - Wikipedia

    en.wikipedia.org/wiki/Solid-state_electronics

    The term solid-state became popular at the beginning of the semiconductor era in the 1960s to distinguish this new technology. A semiconductor device works by controlling an electric current consisting of electrons or holes moving within a solid crystalline piece of semiconducting material such as silicon, while the thermionic vacuum tubes it replaced worked by controlling a current of ...

  5. Electrostatic discharge - Wikipedia

    en.wikipedia.org/wiki/Electrostatic_discharge

    Electrostatic discharge ( ESD) is a sudden and momentary flow of electric current between two differently-charged objects when brought close together or when the dielectric between them breaks down, often creating a visible spark associated with the static electricity between the objects. ESD can create spectacular electric sparks ( lightning ...

  6. Comparison of memory cards - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_memory_cards

    microSD→miniSD→SD→CF The following chart gives details on availability of adapters to put a given card (horizontal) in a given slot or device (vertical). This table does not take into account protocol issues in communicating with the device.

  7. Quantum tunnelling - Wikipedia

    en.wikipedia.org/wiki/Quantum_tunnelling

    Quantum tunnelling falls under the domain of quantum mechanics. To understand the phenomenon, particles attempting to travel across a potential barrier can be compared to a ball trying to roll over a hill. Quantum mechanics and classical mechanics differ in their treatment of this scenario. Classical mechanics predicts that particles that do ...

  8. List of common physics notations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_physics...

    G {\displaystyle G} electrical conductance. siemens (S) universal gravitational constant. newton meter squared per kilogram squared (N⋅m 2 /kg 2 ) shear modulus. pascal (Pa) or newton per square meter (N/m 2 ) g {\displaystyle \mathbf {g} } acceleration due to gravity.

  9. Micro- - Wikipedia

    en.wikipedia.org/wiki/Micro-

    Look up micro- in Wiktionary, the free dictionary. Micro ( Greek letter μ, mu, non- italic) is a unit prefix in the metric system denoting a factor of 10 −6 (one millionth ). [ 1] Confirmed in 1960, the prefix comes from the Greek μικρός ( mikrós ), meaning "small". It is the only SI prefix which uses a character not from the Latin ...