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