enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Electric current - Wikipedia

    en.wikipedia.org/wiki/Electric_current

    The ampere is an SI base unit and electric current is a base quantity in the International System of Quantities (ISQ). [4]: 15 Electric current is also known as amperage and is measured using a device called an ammeter. [2]: 788 Electric currents create magnetic fields, which are used in motors, generators, inductors, and transformers.

  3. Ohm's law - Wikipedia

    en.wikipedia.org/wiki/Ohm's_law

    Similarly, the rate of flow of electrical charge, that is, the electric current, through an electrical resistor is proportional to the difference in voltage measured across the resistor. More generally, the hydraulic head may be taken as the analog of voltage, and Ohm's law is then analogous to Darcy's law which relates hydraulic head to the ...

  4. Electricity - Wikipedia

    en.wikipedia.org/wiki/Electricity

    Electricity plays a central role in many modern technologies, serving in electric power where electric current is used to energise equipment, and in electronics dealing with electrical circuits involving active components such as vacuum tubes, transistors, diodes and integrated circuits, and associated passive interconnection technologies.

  5. Electronics - Wikipedia

    en.wikipedia.org/wiki/Electronics

    The electronics industry consists of various sectors. The central driving force behind the entire electronics industry is the semiconductor industry sector, [33] which has annual sales of over $481 billion as of 2018. [34] The largest industry sector is e-commerce, which generated over $29 trillion in 2017. [35]

  6. Electromagnetic field - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_field

    An electric field is produced when the charge is stationary with respect to an observer measuring the properties of the charge, and a magnetic field as well as an electric field are produced when the charge moves, creating an electric current with respect to this observer. Over time, it was realized that the electric and magnetic fields are ...

  7. Diffusion current - Wikipedia

    en.wikipedia.org/wiki/Diffusion_current

    Hence, due to the flow of holes and electrons there is a current. This current is called the diffusion current. The drift current and the diffusion current make up the total current in the conductor. The change in the concentration of the carrier particles develops a gradient. Due to this gradient, an electric field is produced in the ...

  8. 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.

  9. Drift current - Wikipedia

    en.wikipedia.org/wiki/Drift_current

    In condensed matter physics and electrochemistry, drift current is the electric current, or movement of charge carriers, which is due to the applied electric field, often stated as the electromotive force over a given distance. When an electric field is applied across a semiconductor material, a current is produced due to the flow of charge ...