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  2. Faraday's law of induction - Wikipedia

    en.wikipedia.org/wiki/Faraday's_law_of_induction

    Faraday's experiment showing induction between coils of wire: The liquid battery (right) provides a current which flows through the small coil (A), creating a magnetic field.

  3. Buck–boost converter - Wikipedia

    en.wikipedia.org/wiki/Buck–boost_converter

    Fig. 1: Schematic of a buck–boost converter. Fig. 2: The two operating states of a buck–boost converter: When the switch is turned on, the input voltage source supplies current to the inductor, and the capacitor supplies current to the resistor (output load).

  4. Parallel port - Wikipedia

    en.wikipedia.org/wiki/Parallel_port

    Micro ribbon 36-pin female, such as on printers and on some computers, particularly industrial equipment and early (pre-1980s) personal computers.