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Details Title: ILC Description: ILC Sept 07 Total Flash Cards: 67 Created: 09/10/2007 08:02:29	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term atom Definition the smallest particle of a substance Term electron Definition negatively charged particle Term proton Definition positively charged particle Term stable atom Definition equal # of protons and electrons Term law of charges Definition like charges repel, unlike charges attract Term electron shell Definition an orbit that can hold a set number of electrons Term current Definition flow of electrons from one point to another Term amp Definition measurement of current (electron flow) Term potential Definition difference in electrical charge between two bodies Term volt Definition measurement of potential (difference in charge) Term resistance Definition opposition offered by a substance to passage of electric current Term ohm Definition measurement of resistance Term difference between parallel and series circuit Definition if one part of series fails, all paths fail; if one part of parallel fails, the rest continues working Term load in an electrical circuit Definition a device that converts electricity into light, heat, or mechanical energy Term wires in typical AC circuit; what they're used for Definition ground to earth, neutral return path, hot transmits power Term three types of connectors used on lighting fixtures Definition Edison, Twist Lock, Stage Pin Term typical Edison connector wiring Definition black to gold (hot), white to silver (neutral), green to green (ground) Term what Ohm's Law measures Definition resistance in a circuit Term formula for power consumption Definition W=VxA Term what light does Definition makes vision possible Term 4 properties of light that influence the way we perceive an object Definition intensity, color, sharpness, angle Term why can light be considered a particle? Definition particles travel in straight lines and can travel through a vacuum Term why can light be considered a wave? Definition has properties of waves Term properties of waves Definition diffraction, reflection, refraction Term diffraction Definition waves that pass around/through an object will fill in behind object Term refraction Definition waves change direction as they pass from one medium to another Term visible spectrum Definition wavelengths of light we can see - 400 to 700 nanometers Term what a reflector does Definition control light: collect light, redirect light, create point source Term how a reflector works Definition laws of specular reflection: angle of incidence = angle of reflection Term point of incidence Definition where light strikes the surface of reflector Term angle of incidence Definition angle at which light strikes surface Term angle of reflection Definition angle at which light is reflected off surface Term 3 examples of specular reflectors Definition mirrors, polished metals, calm water Term what a diffuse reflector does Definition maximum dispersion of rays Term example of a near zero reflector Definition black velour Term 3 types of reflectors commonly used in lighting fixtures Definition ellipsoidal, spherical, parabolic, asymmetrical Term what does an ellipsoidal reflector do? Definition collect large portion of light, focus to secondary point. creates intense cone of light Term what does a spherical reflector do? Definition smaller cone of light equal to lens Term what does a parabolic reflector do? Definition rays reflected parallel. creates oval beam of light. concentrate center, diffuse edges. Term what does a lens do? Definition bend light, focus light Term refraction Definition bending light rays by passing through mediums of different optical densities Term speed of light Definition 186,200 miles/second in a vacuum Term optical density Definition speed of light in a medium Term three conditions that influence the bending of light through a lens Definition 1) ratio between incidences of refraction 2) difference in angles of normal 3) wavelength of light Term focal length of a lens Definition distance from optical center to principal foci Term types of lenses used in lighting fixtures Definition plano-convex, fresnel, par Term what type of lens is a plano convex lens? Definition positive spherical Term conventional fixtures commonly used in theater Definition ERS, Leko, Fresnels, Par Cans, Cyc lights, strip lights, scoops, follow spots Term what does ERS stand for? Definition Ellipsoidal Reflector Spotlight Term type of lens used in ERS Definition plano convex lens Term part of optic train where gobos and shutters are placed Definition gate Term what ERS fixtures are commonly used for Definition front lights, key lights, specials, pattern projectors, follow spots, wash lights, effect projectors Term what Fresnel lens was originally developed for Definition lighthouses Term what is special about the Fresnel lens? Definition step lens - retains focal properties of plano convex Term type of light produced by Fresnel lens Definition soft circle Term type of reflector used in Fresnel fixture Definition true circular radius reflector Term common uses for Fresnel Definition wash lights, soft spots, large pools, scenery lights, down lights Term type of lamp used in Par Can Definition sealed beam lamp Term type of reflector used in Par lamp Definition Parabolic Aluminized Reflector Term how to focus a Par Can Definition twist ceramic on back opening - change angle of oval Term lamp designations used in standard Par Cans Definition NSP, VNSP, MFL, WFL Term what Par Cans are typically used for Definition color wash, down light, back light, air light, side light Term type of light used to light a back drop Definition strip lights Term what a strip light is used for Definition broad washes, backdrop lighting Term what a scoop is used for Definition general wash, good work-lights Term what is used to focus a follow-spot Definition a trombone Term where color is held in a follow spot Definition boomerang