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59 Cards in this Set
- Front
- Back
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What is a practical? What are examples? |
An onstage working light source. Ex. Table Lamp; Wall Sconce; Oil Lamp; Flashlight; Tv; Cell Phone |
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What is an effect? What are examples? |
A specialty device designed to give the appearance of being a light source. Ex. Fire effect; Candle; Torch; Lightning; Rain |
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What is a scenic projector? |
A high-wattage instrument used for projecting large-format slides or moving images. |
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What is used for front-screen projection material? What are the positives and negatives? |
Slide or movie screens; A smooth white painted surface Pros- Looks crisp Cons- The Great White Blob; Actor Shadows |
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What are the positive and negatives of rear projection material? |
Pros- No actor shadows Cons- Hot spot |
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What is keystoning? |
The shape created when an image is being projected on a surface that is not perfectly perpendicular to the axis of projection |
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What type of projectors are used most prominently today? |
Digital Projectors |
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What is important to remember about electricity? |
It can kill you
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What is an atom? What is it composed of? |
The smallest particle of a chemical element that retains the structural properties of that element.
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What are the charges of the proton, electron, and neutron? |
Proton- Positive
Electron- Negative Neutron- Neutral |
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What does the law of charges state? |
Like charges repel, and unlike charges attract |
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What is an electrical current and how is an electrical charge created? |
The flow or movement of electrons through a conductor.
Created when electrons are transferred from one place to another. |
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What is the difference between direct and alternating current? |
DC- Short Distance; 1 Way Flow AC- Long Distance; 2 Way Flow |
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What makes up a simple electrical circuit? |
A source, a load, and a circuit
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Series Circuit |
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Parallel Circuit |
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Combination Circuit |
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What does Ohm's law state? |
As voltage increases, current increases; As resistance increases, current decreases. |
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What are the two power formulas? |
P=IE
P- power in watts I- current in amperes E- Voltage in volts W=VA W- power in watts V- voltage in volts A- current in amperes |
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The output voltage of a dimmer is 120 VAC. The dimmer can handle 20 amperes of current. What is the maximum safe load that can be placed on this dimmer? |
watts = volts X amperes (W=VA)
W=120 X 20 =2,400 watts |
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The system voltage is 120 VAC. The dimmer can carry 2,400 watts. The 14-gauge cable connecting the instruments to the dimmer can carry 15 amperes. Using the 14-gauge cable, how many 500-watt lighting instruments can be safely loaded onto the dimmer? |
W=VA
W = 120 X 15 = 1,800 watts 1,800 watts / 500 watts = 3.6 instruments |
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What is a conductor? What are examples? |
Any material with an abundance of free electrons. Ex. Copper, aluminum, gold, and silver |
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What is an insulator? What are examples? |
Any material with few free electrons. Ex. Air, glass, paper, rubber, and most plastics |
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What is a short circuit? |
When a very large surge of current in an overloaded circuit causes a portion of the wire, insulation, or anything else at the point of the short to explode. |
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What is an overload? |
When the current flowing through a circuit is greater than the maximum current for which the system was designed. |
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What is a fuse?
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Contains a soft metallic strip that melts when the current flowing in the circuit exceeds the rated capacity, breaking the circuit and stopping the flow of electricity. Cannot be reset 1 time use. |
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What is a circuit breaker? |
Has a handle with which you can turn the circuit on and off. When the current exceeds the rated capacity an internal bi-metal strip flexes and trips a release to open the circuit. Can be reset. |
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What are the wire colors that the National Electrical Code (NEC) uses for the USA? |
Green- Ground Black; Red- Hot White- Neutral |
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Incandescent Lamp |
Lamp |
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Tungsten-Halogen Lamp |
Lamp |
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Arc Source Lamp |
Lamp |
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Light-Emitting Diode |
Lamp |
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Candelabra Screw Base |
Base |
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Medium Screw Base |
Base |
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Medium Skirted Screw Base |
Base |
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Medium Prefocus Base |
Base |
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Mogul Prefocus Base |
Base |
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Two pin or Bi-Pin Base |
Base |
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Medium Bi-Post Base |
Base |
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Tubular Bulb |
Bulb |
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Arbitrary Bulb |
Bulb |
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Globe Bulb |
Bulb |
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Reflector Bulb |
Bulb |
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Torpedo Bulb |
Bulb |
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Flame/Flicker Bulb |
Bulb |
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PAR Bulb |
Bulb |
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Candle Bulb |
Bulb |
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Fresnel Lens |
Lens |
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Plano-Convex Lens |
Lens |
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Bi-Convex Lens |
Lens |
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Convex-Concave Lens |
Lens |
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Bi-Concave Lens |
Lens |
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Spherical Reflector |
Reflector |
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Ellipsoidal Reflector |
Reflector |
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Parabolic Reflector |
Reflector |
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Very Narrow Wash |
Wash |
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Narrow Wash |
Wash |
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Medium Wash |
Wash |
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Wide Wash |
Wash |
