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  2. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    Toll-free telephone number. A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls. For the calling party, a call to a toll-free number from a landline is free of charge. A toll-free number is identified by a dialing prefix similar to an area code.

  3. Gratis versus libre - Wikipedia

    en.wikipedia.org/wiki/Gratis_versus_libre

    Gratis open access refers to online access free of charge (which Wikipedia indicates with the icon ), and libre open access refers to online access free of charge plus some additional re-use rights (Wikipedia icon ). [4] Libre open access is equivalent to the definition of open access in the Budapest Open Access Initiative, the Bethesda ...

  4. Electric charge - Wikipedia

    en.wikipedia.org/wiki/Electric_charge

    The charge due to polarization is known as bound charge, while the charge on an object produced by electrons gained or lost from outside the object is called free charge. The motion of electrons in conductive metals in a specific direction is known as electric current. Unit. The SI unit of quantity of electric charge is the coulomb (symbol: C).

  5. State of charge - Wikipedia

    en.wikipedia.org/wiki/State_of_charge

    State of charge. State of charge ( SoC) quantifies the remaining capacity available in a battery at a given time and in relation to a given state of ageing. [1] It is usually expressed as percentage (0% = empty; 100% = full). An alternative form of the same measure is the depth of discharge ( DoD), calculated as 1 − SoC (100% = empty; 0% = full).

  6. Open access - Wikipedia

    en.wikipedia.org/wiki/Open_access

    Open access. Open access logo, originally designed by Public Library of Science. A PhD Comics introduction to open access. Open access ( OA) is a set of principles and a range of practices through which research outputs are distributed online, free of access charges or other barriers. [1]

  7. Gauss's law - Wikipedia

    en.wikipedia.org/wiki/Gauss's_law

    Here, the electric field outside ( r > R) and inside ( r < R) of a charged sphere is being calculated (see Wikiversity ). In physics (specifically electromagnetism ), Gauss's law, also known as Gauss's flux theorem (or sometimes Gauss's theorem), is one of Maxwell's equations. It relates the distribution of electric charge to the resulting ...

  8. Freeware - Wikipedia

    en.wikipedia.org/wiki/Freeware

    XnView is available free of charge for personal use but must be licensed for commercial use. The free version may be advertising supported, as was the case with the DivX. Ad-supported software and free registerware also bear resemblances to freeware. Ad-supported software does not ask for payment for a license, but displays advertising to ...

  9. Charge density - Wikipedia

    en.wikipedia.org/wiki/Charge_density

    Linear charge density (λ) is the quantity of charge per unit length, measured in coulombs per meter (C⋅m −1 ), at any point on a line charge distribution. Charge density can be either positive or negative, since electric charge can be either positive or negative. Like mass density, charge density can vary with position.

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