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atom with equal # of protons and electrons |
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where electron orbits atom |
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flow of electricity through conductor |
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capacity of electrical system to do work |
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measurement of electrical change between two bodies |
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3 wires in AC circuit and what they’re used for |
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green-ground; white-neutral; black-hot |
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why light can be considered a particle |
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travels in straight lines and can travel through a vacuum |
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diffraction, reflection, refraction |
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what does diffraction mean? |
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waves fill in behind obstruction |
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what does refraction mean? |
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waves bend as they pass from one medium to another |
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where light strikes surface of reflector |
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angle between normal and reflected angle |
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what does an ellipsoidal reflector do? |
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redirects light rays to a secondary point |
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what is the focal length of a lens? |
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distance from optical center to principal foci |
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what type of lens is a plano convex lens? |
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conventional fixtures commonly used in theatre |
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ERS, leko, fresnels, par cans, cyc lights, strip lights, follow spots |
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ellipsoidal reflector spotlight |
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what are ERS fixtures commonly used for? |
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front lights, key lights, specials |
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what was the fresnel lens ORIGINALLY developed for? |
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what type of reflector is used in a fresnel fixture? |
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what type of reflector is used in a par lamp? |
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PARABOLIC aluminized reflector |
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how do you focus a par can? |
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what are par cans typically used for? |
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