Safety Quiz Flashcards
Connecting the lighting instruments to the dimmer board is known as _________________ / _______________.
hooking up / plugging in
Another short length of cable used to connect the instrument’s too-short original cable to the plug is a __________________.
jumper
A receptacle on the stage is also referred to as a _________ __________.
stage pocket
The place where cables end in a theater so they don’t just pop out of the floor is the _______ ________.
patch panel
What is “ghost loading?”
Adding a light that doesn’t matter and sticking it backstage.
The _______ is the most significant electrical system in the body.
heart
Electricity always follows the path of ________ ______________ to the ground.
least resistance
Contained systems that predictably allow us to know where the electricity is going are __________.
circuits
What is a “short circuit?”
- when electricity goes from source to source without a load
- has the ability to blow a system
- too fast for system to handle w/out resistance from the load
A __________ __________ detects the speed of the electricity circuit.
circuit breaker
What are the two ways in which a circuit breaker detects the speed of an electricity circuit?
- temperature
- magnetic trip
Describe a “series” design for circuitry.
[source] —- [load]
| |
[load] —- [load]
If any one load drops out in a SERIES design…
- open circuit
- the whole electricity goes out
Describe a “parallel” design for circuitry.
|—————–|————|———–|
[source] – [load] — [load] — [load]
|—————–|————|———–|
If any one load drops out in a PARALLEL design…
electricity still continues for the other loads
When you increase resistance, the entire system…
dims down
Why was the integration of electronic dimmers revolutionary?
- dimmer is in a remote location
- heat and danger away from performers
- still 1:1 relationship btwn. controls and dimmers
Connecting the dimmer to the correct light is known as _________.
patching
What is a hard patch?
physically connecting a component of the system
(Between hot, neutral and ground) - Which can hurt you no matter what?
HOT
(Between hot, neutral and ground) - Which can only hurt you when electricity is flowing through?
neutral
(Between hot, neutral and ground) -
The color GREEN typically indicates which?
ground
(Between hot, neutral and ground) -
The color WHITE typically indicates which?
neutral
(Between hot, neutral and ground) -
Any other colors BESIDES GREEN AND WHITE typically indicates which>
hot (red and black are the most common)
Ground _______ first and _______ last.
makes first, breaks last
A “2P and G” is a what?
2 pin and ground connector (like the outlet face :o)
How much electricity is available for you to use is the ___________.
voltage
What is the WVA?
watts = volts * amps
The way was classify the color of a light source is the __________ ____________.
Kelvin temperature
Name the three parts of a lightbulb and their functions.
- BASE
(how to connects to the source) - ENVELOPE
(the clear container that contains gas) - FILAMENT
(the wire element inside the lamp)
Which part of the lightbulb should you NOT TOUCH?
the envelope
In colored lighting, subtractive mixing is…
when you start with white and then add colored gels to get the color you want.
In colored lighting, additive mixing is…
when you add lights to get what you want.
A silver terminal screw is usually (hot/neutral/ground).
neutral
A brass terminal screw is usually (hot/neutral/ground).
hot
This is the only type of light that can dim through a theater dimmer system.
incandescent
For this type of light, when you run a current through, it glows.
incandescent
For the type of light, when you send electricity in proximity, the material coating on the inside of the tube begins to glow.
fluorescent
Glowing in nature is called…
bioluminescence.
This type of light is made of 2 electrodes w/ metal housing, and the spark jumps the gap between two rods.
arc lights
This type of light is when the gas itself responds to an electrical impulse.
gas discharge light
True or False: an LED can only have one color.
true
Where are LEDs dimmable?
in a household (not in a theater!)
Computers don’t run dimmers. Computers remember _________.
numbers
Is a board enabled to soft patch or hard patch?
soft patch (every place you plug in a light is already connected to a dimmer)
What are wash systems / wash lights?
Lights that are NOT areas, scenic or specials. Examples are backlight and side light.
What is the best angle of light for visibility?
at the object, right above the viewer’s head
Describe the “most natural” light.
An isosceles right triangle in which the object and its shadow are the same height and the light, the hypotenuse, creates a 45 degree angle.
The measure of the quantity of light where the object / space is being illuminated is the _____ _________.
foot candle
The measure of the quantity of light being emitted is the ________.
lumens
On a light plot, a line running horizontally through a space is a ______.
plane
On a light plot, a line running vertically through a space is a ______.
zone
A lamp is the same thing as a _________.
lightbulb
What is the basic rule of reflection?
The angle of incidence will always match the angle of reflection.
What are the three main reflectors?
- spherical
- parabolic
- ellipsoidal
Describe the spherical reflector.
- focal point at halfway point
- beam of light is not reshaped
- outputs double the light because it reflects against itself
Describe the parabolic reflector.
- focal point further back from halfway
- reflected rays are all parallel to each other
- used in large telescopes
Describe the ellipsoidal reflector.
- beams bounce on areas of the outside
In graphics standards for ellipsoidals, a 6x12 is marked by:
[slash]
In graphics standards for ellipsoidals, a 6x16 is marked by:
[X]
In graphics standards for ellipsoidals, a 6x9 is marked by:
[ ]
In graphics standards for ellipsoidals, a 6x22 is marked by:
[’ ‘]
In graphics standards for ellipsoidals, a 6x6 is marked by:
[v]
In graphics standards for ellipsoidals, 6x12 has an angle measure of:
26 degrees
In graphics standards for ellipsoidals, 6x16 has an angle measure of:
19 degrees
In graphics standards for ellipsoidals, 6x9 has an angle measure of:
36 degrees
In graphics standards for ellipsoidals, 6x22 has an angle measure of:
10 degrees
In graphics standards for ellipsoidals, 6x6 has an angle measure of:
50 degrees
On a light plot, the center line looks like this.
_________ _ _________ _ __________ _
On a light plot, the plaster line looks like this.
__ __ __ __ __ __ __ __ __ __ __ __ __ __
Describe the light from and affordances of an ellipsoidal.
- strong light
- able to utilize gel overlays
- use the shades to shape the light
- use a gobo for shapes
Describe the light from and the affordances of a fresnel.
- circular light
- soft
- you can focus / widen the light
- common in all of FTT
Describe the light from and the affordances of a PAR.
- oval-shaped light
- fixed diameter of light
- a little brighter than a fresnel because it is a simple-function light
A “soft patch” refers to the connection between…
the channel and the dimmer
A “hard patch” refers to the connection between…
the dimmer and the circuit
A (soft/hard) patch occurs within the software of a computer.
soft
A (soft/hard) patch occurs when you make a physical electrical connection.
hard
What is the US standard for voltage?
120V
The unit of measure for an electrical current is ________.
amps
Electrical systems in the US are either…
three-phase or single-phase
You should never work on a ______ circuit.
LIVE
Electricity switches directions every wave in a (single-phase / three-phase) system.
single-phase
Which system is used when electricity requirement is HIGH?
three-phase
Which system is used when electricity requirement is LOW?
single-phase
Small equipment can be run by (single-phase / three-phase) systems.
single-phase
Large equipment can be run by (single-phase / three-phase) systems.
three-phase
Watts measure the _________, while lumens measure the _________.
Watts measure the amount of power within a lightbulb.
Lumens measure the amount of light emitted from the lightbulb.
