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  2. Holiday lighting technology - Wikipedia

    en.wikipedia.org/wiki/Holiday_lighting_technology

    Screw-base C7 and C9 light sets use line voltage (120 volt) bulbs and are wired in parallel. LED-based sets use a current-limiting resistor to reduce the current supplied to each LED. Neon-lamp-based sets have lamps connected in parallel, each with its own current-limiting resistor. Battery-powered sets are also wired in parallel. [citation needed]

  3. Series and parallel circuits - Wikipedia

    en.wikipedia.org/wiki/Series_and_parallel_circuits

    If the light bulbs are connected in parallel, the currents through the light bulbs combine to form the current in the battery, while the voltage drop is 12 volts across each bulb and they all glow. In a series circuit, every device must function for the circuit to be complete. If one bulb burns out in a series circuit, the entire circuit is broken.

  4. Safelight - Wikipedia

    en.wikipedia.org/wiki/Safelight

    An amber (light brown) safelight for use with certain black-and-white photographic papers. A safelight is a light source suitable for use in a photographic darkroom. It provides illumination only from parts of the visible spectrum to which the photographic material in use is nearly, or completely insensitive.

  5. Incandescent light bulb - Wikipedia

    en.wikipedia.org/wiki/Incandescent_light_bulb

    An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a filament that is heated until it glows. The filament is enclosed in a glass bulb that is either evacuated or filled with inert gas to protect the filament from oxidation. Electric current is supplied to the filament by terminals or wires ...

  6. Group testing - Wikipedia

    en.wikipedia.org/wiki/Group_testing

    A familiar example of group testing involves a string of light bulbs connected in series, where exactly one of the bulbs is known to be broken. The objective is to find the broken bulb using the smallest number of tests (where a test is when some of the bulbs are connected to a power supply). A simple approach is to test each bulb individually.

  7. Luminaria - Wikipedia

    en.wikipedia.org/wiki/Luminaria

    Use of the word luminaria for paper lanterns is considered incorrect by some New Mexicans and is a frequent topic of debate. Yet another form of luminaria, a small torch or large candle, is carried by the leader of the procession of Las Posadas , [ 4 ] a nine-day holiday running December 16–24.

  8. Circuit topology (electrical) - Wikipedia

    en.wikipedia.org/wiki/Circuit_topology_(electrical)

    In the field of electrical networks, two additional transforms are considered to result in equivalent graphs which do not produce congruent graphs. The first of these is the interchange of series-connected branches. This is the dual of interchange of parallel-connected branches which can be achieved by deformation without the need for a special ...

  9. Flashlight - Wikipedia

    en.wikipedia.org/wiki/Flashlight

    Miniature incandescent bulbs for use in flashlights: The tungsten filament bulb was essential to turn the flashlight from a novelty to a useful tool. Incandescent flashlights use incandescent light bulbs, which consists of a glass bulb and a tungsten filament. The bulbs are under vacuum or filled with argon, krypton, or xenon.

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