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  2. Capacitance - Wikipedia

    en.wikipedia.org/wiki/Capacitance

    If the charges on the plates are + and , and gives the voltage between the plates, then the capacitance is given by =, which gives the voltage/current relationship = +, where () is the instantaneous rate of change of voltage, and is the instantaneous rate of change of the capacitance.

  3. RC time constant - Wikipedia

    en.wikipedia.org/wiki/RC_time_constant

    It is the time required to charge the capacitor, through the resistor, from an initial charge voltage of zero to approximately 63.2% of the value of an applied DC voltage, or to discharge the capacitor through the same resistor to approximately 36.8% of its initial charge voltage.

  4. Capacitor - Wikipedia

    en.wikipedia.org/wiki/Capacitor

    Common tolerances are ±5%, ±10%, and ±20%, denotes as J, K, and M, respectively. A capacitor may also be labeled with its working voltage, temperature, and other relevant characteristics. Example: A capacitor labeled or designated as 473K 330V has a capacitance of 47 × 10 3 pF = 47 nF (±10%) with a maximum working voltage of 330 V. The ...

  5. Ćuk converter - Wikipedia

    en.wikipedia.org/wiki/Ćuk_converter

    The diode and the switch are simplified as either a short circuit when they are on or by an open circuit when they are off. When in the off-state, the capacitor C is charged by the input source through the inductor L 1. When in the on-state, the capacitor C transfers the energy to the output capacitor through the inductance L 2.

  6. Two capacitor paradox - Wikipedia

    en.wikipedia.org/wiki/Two_capacitor_paradox

    One of the capacitors is charged with a voltage of , the other is uncharged. When the switch is closed, some of the charge = on the first capacitor flows into the second, reducing the voltage on the first and increasing the voltage on the second. When a steady state is reached and the current goes to zero, the voltage on the two capacitors must ...

  7. Current density - Wikipedia

    en.wikipedia.org/wiki/Current_density

    In electromagnetism, current density is the amount of charge per unit time that flows through a unit area of a chosen cross section. [1] The current density vector is defined as a vector whose magnitude is the electric current per cross-sectional area at a given point in space, its direction being that of the motion of the positive charges at this point.

  8. Farad - Wikipedia

    en.wikipedia.org/wiki/Farad

    The capacitance of a capacitor is one farad when one coulomb of charge changes the potential between the plates by one volt. [1] [2] Equally, one farad can be described as the capacitance which stores a one-coulomb charge across a potential difference of one volt. [3] The relationship between capacitance, charge, and potential difference is linear.

  9. Double-layer capacitance - Wikipedia

    en.wikipedia.org/wiki/Double-layer_capacitance

    Because an electrochemical capacitor is composed out of two electrodes, electric charge in the Helmholtz layer at one electrode is mirrored (with opposite polarity) in the second Helmholtz layer at the second electrode. Therefore, the total capacitance value of a double-layer capacitor is the result of two capacitors connected in series.