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The timer may switch equipment on, off, or both, at a preset time or times, after a preset interval, or cyclically. A countdown time switch switches power, usually off, after a preset time. A cyclical timer switches equipment both on and off at preset times over a period, then repeats the cycle; the period is usually 24 hours or 7 days.
Electric current is supplied to the filament by terminals or wires embedded in the glass. A bulb socket provides mechanical support and electrical connections. Incandescent bulbs are manufactured in a wide range of sizes, light output, and voltage ratings, from 1.5 volts to about 300 volts.
A candelabra, with lit candles. A candelabrum (plural candelabra but also used as the singular form) is a candle holder with multiple arms. [1] [2] [3] "Candelabra" can be used to describe a variety of candle holders including chandeliers. However, candelabra can also be distinguished as branched candle holders that are placed on a surface such ...
An ornate American candelabra hung with crystals described as a girandole [10] Girandole has been used as a term for a variety of lighting devices and objects. Originally a term for a type of firework, it was used in the second half of the 17th century in France to mean a type of candelabra, usually with 6 arms emerging from a central stem. [8]
An electric light, lamp, or light bulb is an electrical component that produces light.It is the most common form of artificial lighting.Lamps usually have a base made of ceramic, metal, glass, or plastic which secures the lamp in the socket of a light fixture, which is often called a "lamp" as well.
A seven-branched candelabra, known as the menorah, is the national symbol of the State of Israel, based on the candelabra that was used in the Temple in Jerusalem in ancient times. Another special candelabra found in many Jewish homes is the Hanukiah, the Hanukkah menorah that holds eight candles plus an extra one for lighting the others.
This private residence in Jamaica Plain, Boston displayed 250,000 lights in 2006. The electric utility company installed special wiring; the electric bill was $2,000 per month. Incandescent (midget) or LED-based sets usually have each lamp connected in series to be powered without a transformer in the set. Screw-base C7 and C9 light sets use ...
Wire crossover symbols for circuit diagrams. The CAD symbol for insulated crossing wires is the same as the older, non-CAD symbol for non-insulated crossing wires. To avoid confusion, the wire "jump" (semi-circle) symbol for insulated wires in non-CAD schematics is recommended (as opposed to using the CAD-style symbol for no connection), so as to avoid confusion with the original, older style ...