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  2. Parabolic aluminized reflector - Wikipedia

    en.wikipedia.org/wiki/Parabolic_aluminized_reflector

    As with the case of LED MR lamps, LED PAR lamps generally use an array of individual LED elements that are unsuitable for reflector operation. Nevertheless, some degree of beam control can be obtained with aperture or lens, and LED PAR 38 replacements with a 40° spread is common. Models built for stage lighting may use less similar dimensions.

  3. Reference designator - Wikipedia

    en.wikipedia.org/wiki/Reference_designator

    A reference designator unambiguously identifies the location of a component within an electrical schematic or on a printed circuit board.The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15.

  4. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    Simple LED circuit with resistor for current limiting. The current in an LED or other diodes rises exponentially with the applied voltage (see Shockley diode equation), so a small change in voltage can cause a large change in current. Current through the LED must be regulated by an external circuit such as a constant current source to prevent ...

  5. Equivalent circuit - Wikipedia

    en.wikipedia.org/wiki/Equivalent_circuit

    Often, an equivalent circuit is sought that simplifies calculation, and more broadly, that is a simplest form of a more complex circuit in order to aid analysis. [1] In its most common form, an equivalent circuit is made up of linear, passive elements. However, more complex equivalent circuits are used that approximate the nonlinear behavior of ...

  6. ANSI device numbers - Wikipedia

    en.wikipedia.org/wiki/ANSI_device_numbers

    22 – Equalizer Circuit Breaker; 23 – Temperature control device, Heater; 24 – Volts per Hertz Relay (in some old analog applications, a 59 and an 81 device would be chained together as a 59/81 to implement the equivalent of V/Hz protection) 25 – Synchronizing or Synchronism-check Device; 26 – Apparatus Thermal Device, Temperature Switch

  7. TikToker Joules Dies After Rare Brain Tumor at 6 Years Old ...

    www.aol.com/tiktoker-joules-dies-rare-brain...

    Joules Smith's father Joe confirmed on social media that she died from diffuse intrinsic pontine glioma (DIPG) on Dec. 9

  8. Syrian Christians attend services, schools reopen a week ...

    www.aol.com/news/syrian-authorities-reopen...

    DAMASCUS/LATAKIA, Syria (Reuters) -Syrian Christians attended regular Sunday services for the first time since the dramatic overthrow of President Bashar al-Assad a week ago, in an early test of ...

  9. List of DIN standards - Wikipedia

    en.wikipedia.org/wiki/List_of_DIN_standards

    Directions and signs in electrical engineering; rules for electric and magnetic circuits, equivalent circuit diagrams: Withdrawn: DIN EN 60375: EN 60375: DIN 5493-2: Logarithmic quantities and units – Part 2: Logarithmic ratios, levels in nepers and decibels: Active: DIN 5510-2: Fire test to railway components: Active: DIN 5590