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  2. DigiKey - Wikipedia

    en.wikipedia.org/wiki/Digikey

    DigiKey is the fourth largest electronic component distributor in North America and the fifth largest electronic component distributor overall. [3] Stordahl privately owns the company . [4] The name "Digi-Key" is a reference to the "Digi-Keyer Kit," a digital electronic keyer kit that Stordahl developed and marketed to amateur radio enthusiasts.

  3. Light-emitting diode physics - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode_physics

    Electrons cross from the n-region and recombine with the holes existing in the p-region. Free electrons are in the conduction band of energy levels, while holes are in the valence energy band. Thus the energy level of the holes is lower than the energy levels of the electrons.

  4. List of resistors - Wikipedia

    en.wikipedia.org/wiki/List_of_resistors

    The result is a reasonable tolerance (0.5%, 1%, or 2%) and a temperature coefficient that is generally between 50 and 100 ppm/K. [9] Metal film resistors possess good noise characteristics and low non-linearity due to a low voltage coefficient. They are also beneficial due to long-term stability.

  5. Power over Ethernet - Wikipedia

    en.wikipedia.org/wiki/Power_over_Ethernet

    PoDL initially defined ten power classes, ranging from 0.5 to 50 W (at PD). Subsequently, PoDL was added to the single-pair variants 10BASE-T1 , [ 16 ] 2.5GBASE-T1, 5GBASE-T1 , and 10GBASE-T1 [ 17 ] , and as of 2021 [update] it includes a total of 15 power classes with additional intermediate voltage and power levels.

  6. Diode - Wikipedia

    en.wikipedia.org/wiki/Diode

    Various semiconductor diodes. Left: A four-diode bridge rectifier.Next to it is a 1N4148 signal diode.On the far right is a Zener diode.In most diodes, a white or black painted band identifies the cathode into which electrons will flow when the diode is conducting.

  7. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    One of the challenges is the development of more efficient green LEDs. The theoretical maximum for green LEDs is 683 lumens per watt but as of 2010 few green LEDs exceed even 100 lumens per watt. The blue and red LEDs approach their theoretical limits. [citation needed] Multicolor LEDs offer a means to form light of different colors.

  8. Orders of magnitude (power) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(power)

    For reference, about 10,000 100-watt lightbulbs or 5,000 computer systems would be needed to draw 1 MW. Also, 1 MW is approximately 1360 horsepower. Modern high-power diesel-electric locomotives typically have a peak power of 3–5 MW, while a typical modern nuclear power plant produces on the order of 500–2000 MW peak output.

  9. Electronic color code - Wikipedia

    en.wikipedia.org/wiki/Electronic_color_code

    A 2.26 kΩ, 1%-precision resistor with 5 color bands (), from top, 2-2-6-1-1; the last two brown bands indicate the multiplier (×10) and the tolerance (1%).. An electronic color code or electronic colour code (see spelling differences) is used to indicate the values or ratings of electronic components, usually for resistors, but also for capacitors, inductors, diodes and others.