Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Stagecraft and Lighting > lights and electricity > Flashcards

lights and electricity Flashcards

1
Q

the physical effects of electrons moving from a negative to a positive charge

A

Electromagnetism

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

types of electricity

A

static, kinetic (current), field

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

created when two items are rubbed together, one item loses electrons and another gains those electrons creating charge

A

Static Electricity (ex Lightning)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

when electrons move from negative to positive

A

Current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Potential energy VS Kinetic energy

A

the potential for something to act or move turns into the energy given off by movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what must there be fore a current to happen

A

a uninterrupted circuit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

materials that have plentiful “free” electrons

A

Conductor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Name conductors

A

silver, gold, copper, aluminum, seawater, graphite, lemon juice

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

materials that have few or no “free” electrons

A

insulator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

name insulators

A

rubber, glass, oil, air, diamond, dry wood, dry cotton, plastic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

west virginia law

A

wattage/voltage=amperage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what 3 things compose a circuit

A

power source, a path, a load

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

type of circuit required to make electricity flow

A

closed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

simple circuit

A

one “on and off” light, ex flashlight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

series circuit

A

one switch that controls 3 lights connected together

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

parallel circuit

A

one switch for each light, connected to one power cord

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The flow of electricity changes direction periodically

A

alternating current; allows electricity to be sent much further

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

flow of electricity maintains its direction

A

direct current; how batteries and many portable electronics work

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Edison VS Telsa

A

Edison wanted direct current but tesla had patent for alternating current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

high pressure with more coming through

A

voltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

smaller area for current to get through

A

resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

how fast electricity is moving

A

amperage; can get more by inccreasing voltage or lowering resistance

23
Q

device used to control the average voltage of electricity sent to a fixture

A

dimmer

24
Q

type of power dimmers use

A

three phase power

25
Q

where dimmers are located numerously

A

“rack”

26
Q

how three phase power works

A

three conductors control three separate lines of power, each in different phases
3 AC currents on 3 separate wires
smoother than only 2 lines of power

27
Q

dimming by increasing or decreasing resistance via length

A

Rheostat dimmer

28
Q

used distance in a salt water tub to control voltage

A

Saltwater dimmer, very dangerous

29
Q

What kind of dimmer substitute is used and why?

A

Constant Power Module (CPM) b/c not all lights can take AC power, they require a steady supply (DC)

30
Q

What kind of fixtures require steady power?

A

foggers and hazers, LEDs, moving fixtures, pyro

31
Q

What is DMX512 used for

A

(Digital Multiplex with 512 pieces of info) used to send signal from console to dimmer rack which sends to a power fixture
each separate piece has a specific value that tells the light what to do

32
Q

What 3 things are produced by a lighting designer?

A

Light plot
lighting section
channel hookup and other paperwork

33
Q

3 things you can change about a light

A

Intensity, Color, Direction

34
Q

tungsten filament inside a halogen gas lamp

A

Tungsten Halogen Lamp; standard incandescent lamp

35
Q

plasma arc in place of filament

A

Metal Halide lamp; created by passing current through ionized halide gas

36
Q

created by ETC, uses multiple filaments at 575 watts, rotating shutter barrel, most control

A

Source Four

37
Q

lens that sends light away from center

A

concave lens

38
Q

light that sends light from one focal point

A

plano-convex lens

39
Q

lends that sends all light to one focal point and flips the direction

A

convex

40
Q

a measurement of illuminance of a single candela source

A

foot candle

41
Q

another measurement for light

A

lumen

42
Q

light sits in exact middle of reflector and sends light out through focal point

A

Ellipsoidal reflector spotlight; why shutters operate backwards

43
Q

focusing lamp inside center of the fixture

A

Bench Focus

44
Q

Why is it called an Ellipse? (In ERS)

A

b/c lamp sits at one focal point and shutters/gobo sit at a second

45
Q

Describe three main distinguishers of a PAR

A

this light was originally used as headlights in the jeeps of WW2 -the reflector is a parabola because there is only one focal point
-in order to change the size of the beam, in this fixture you replace the lamp from MFL, XWFL, VNS

46
Q

originally invented for lighthouses, uses a stepped lens

A

Fresnel

47
Q

big light with no way to control it, mostly the lamp

A

Scoop light

48
Q

often used for cyc lighting, footlights or color wash

A

Strip Light; gels can be added to each lamp or colored glass can be used

49
Q

How many circuits does a strip light have?

A

3 - 4

50
Q

this light uses an iris, colored frames, intensity lever, and a high intensity discharge lamp

A

Spotlight

51
Q

What does LED stand for

A

Light emitting diode fixtures

52
Q

Which light is becoming standard fixture

A

LED, used to be Source Four

53
Q

Parts of a Source Four

A 
Lens
Gel Frame
Barrel
Barrel Adjustment Knob
Shutter Assembly
Shutter
Barrel Rotation Knob
Tilt Adjustment Knob
Yoke
End Cap

Stagecraft and Lighting (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions