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Battery–capacitor Flash
A battery–capacitor flash (BC flash) is a flash photography system used with flashbulbs. Instead of relying directly on the current pulse ability of a photoflash battery to directly fire a flashbulb, a battery is used to charge a capacitor A capacitor is a device that stores electrical energy in an electric field by virtue of accumulating electric charges on two close surfaces insulated from each other. It is a passive electronic component with two terminals. The effect of ... that is then discharged through the flashbulb. BC flash units use 5.6 V, 15 V, or 22½ V batteries. Advantages A special high-current photoflash battery is not needed, and even an ageing battery can charge the capacitor, although recycling more slowly than a fresh one; the charged capacitor delivers a high-current pulse and reliably fires the bulb. References * Electronics for Photographers, by Marshall Lincoln, Copyright 1966 by Chilton Books, pp 43–54. Capacitors & Bat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polaroid Bc Flash Model 281 IMGP1842 WP
Polaroid may refer to: * Polaroid Corporation, an American company known for its instant film and cameras * Polaroid camera, a brand of instant camera formerly produced by Polaroid Corporation * Polaroid film, instant film, and photographs * Polaroid B.V., a Dutch manufacturer of instant film and cameras, owner of Polaroid Corporation's brand and intellectual property * Polaroid (polarizer), a type of synthetic plastic sheet used to polarize light * Polaroid Eyewear, with glare-reducing polarized lenses made from Polaroid's polarizer Film and television * '' Polaroid Song'', a 2012 French short film directed by Alphonse Giorgi and Yann Tivrier * ''Polaroid'' (film), a 2019 American horror film directed by Lars Klevberg Music * ''Polaroid'' (album), an album by Phantom Planet * ''Gentlemen Take Polaroids'', an album by the new wave band Japan * '' Polaroids: A Greatest Hits Collection'', a compilation album by Shawn Colvin * "Polaroid" (Jonas Blue, Liam Payne and Lennon Stella so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flash (photography)
A flash is a device used in photography that produces a brief burst of light (typically lasting 1/1000 to 1/200 of a second) at a color temperature of about 5500 K to help illuminate a scene. A major purpose of a flash is to illuminate a dark scene. Other uses are capturing quickly moving objects or changing the quality of light. ''Flash'' refers either to the flash of light itself or to the electronic flash unit discharging the light. Most current flash units are electronic, having evolved from single-use flashbulbs and flammable powders. Modern cameras often activate flash units automatically. Flash units are commonly built directly into a camera. Some cameras allow separate flash units to be mounted via a standardized accessory mount bracket (a ''hot shoe''). In professional studio equipment, flashes may be large, standalone units, or studio strobes, powered by special battery packs or connected to mains power. They are either synchronized with the camera using a flas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photoflash Battery
A photoflash battery is a specialized zinc-carbon battery optimized to provide a high electric current output for a very short time, such as required to fire a Flash (photography), flashbulb. Service life for this battery in applications where a lower but continuous current is required, such as for a flashlight with incandescent bulb, is short. Photoflash Electrochemical cell, cells were in production during the flashbulb era, and were phased out as alkaline cells came into general use, and one-use flashbulbs were replaced by electronic flash. The photoflash cell was produced in 1.5 volt D battery, D, C, and AA size. The cathode of a zinc-carbon cell is usually made of powdered carbon black (or acetylene black), manganese dioxide and electrolyte. The MnO2 to carbon ratio varies between 10:1 and 3:1 for general purpose cells, but a 1:1 mixture is used for photoflash batteries, allowing a high current output with intermittent use, as required for photoflash use. These cells have l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capacitor
A capacitor is a device that stores electrical energy in an electric field by virtue of accumulating electric charges on two close surfaces insulated from each other. It is a passive electronic component with two terminals. The effect of a capacitor is known as capacitance. While some capacitance exists between any two electrical conductors in proximity in a circuit, a capacitor is a component designed to add capacitance to a circuit. The capacitor was originally known as the condenser, a term still encountered in a few compound names, such as the ''condenser microphone''. The physical form and construction of practical capacitors vary widely and many types of capacitor are in common use. Most capacitors contain at least two electrical conductors often in the form of metallic plates or surfaces separated by a dielectric medium. A conductor may be a foil, thin film, sintered bead of metal, or an electrolyte. The nonconducting dielectric acts to increase the capacitor's c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volt
The volt (symbol: V) is the unit of electric potential, electric potential difference (voltage), and electromotive force in the International System of Units (SI). It is named after the Italian physicist Alessandro Volta (1745–1827). Definition One volt is defined as the electric potential between two points of a conducting wire when an electric current of one ampere dissipates one watt of power between those points. Equivalently, it is the potential difference between two points that will impart one joule of energy per coulomb of charge that passes through it. It can be expressed in terms of SI base units ( m, kg, second, s, and ampere, A) as : \text = \frac = \frac = \frac. It can also be expressed as amperes times ohms (current times resistance, Ohm's law), webers per second (magnetic flux per time), watts per ampere (power per current), or joules per coulomb (energy per charge), which is also equivalent to electronvolts per elementary charge: : \text = \tex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flash Photography
A flash is a device used in photography that produces a brief burst of light (typically lasting 1/1000 to 1/200 of a second) at a color temperature of about 5500 K to help illuminate a scene. A major purpose of a flash is to illuminate a dark scene. Other uses are capturing quickly moving objects or changing the quality of light. ''Flash'' refers either to the flash of light itself or to the electronic flash unit discharging the light. Most current flash units are electronic, having evolved from single-use flashbulbs and flammable powders. Modern cameras often activate flash units automatically. Flash units are commonly built directly into a camera. Some cameras allow separate flash units to be mounted via a standardized accessory mount bracket (a ''hot shoe''). In professional studio equipment, flashes may be large, standalone units, or studio strobes, powered by special battery packs or connected to mains power. They are either synchronized with the camera using a flas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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