52 terms

# Quiz 3.

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Electricity
electrons transferred from one place to another
conductor
allows electrons 2 flow freely
insulator
inhibits the flow of electrons
AC DC
2 types of electricity (electron flow)
Direct Current (batteries)
DC stands for
Alternating Current (generators)
AC stands for
R E P I
units of measurements are
Ohms (resistance)
uom R stands for
volts
uom E stands for
watts
uom P stands for
amperes
uom I stands for
transformer
voltage must be reduced for us to use our electrical needs
voltage
(blank) must be reduced by means of transformers to a more useable level for most of our electrical needs
Ohms Law
I=E/R amperage=voltage/resistance
rate of flow
electrical potential/ resistance
law of charges
like charges repel unlike charges attract
Volts
E(EMF)
Volts
pressue that causes electrons to flow
Electrical Pressure
E=IxR rate of flow x's resistance (equation for volts)
amperes
measures the rate of electron flow
rate of flow
E/R
Power Formula
P=IE (w-va)
w=va
wattage=voltage x amperage
120
all voltage equals
black or red
Wire Colors hot or positive pole=
white
WC neutral pole=
green
WC ground pole=
single phase power
is generated at 60 cycles per sec.
ohms=r
a measurement of how much resistance there is to the flow of electrons
r=e/i
resistance=electrical pressure/rate of flow
i=e/r
less resistance=more amperage
resistance
wire coils vary resistance
auto transformers
vary the voltage
electric dimmers
low voltage SCR
gating principle
switches voltage on/off 120x's a second
48d
1/2 rack of Dimmers=
96d
full rack of Dimmers=
Digital
DMX 512
Analog
AMX 192 standard analog. signal
control boards
manual preset computers
sources of power
battery(1200volts) generator(6000 600volts) transformer(120volts)
NEC
National Electric Code
circuits
series parallel
AC Sine Curve
the alternating current sine curve created by an AC generator
3 Phase Sine Curves
the overlapping sine curves produced by an AC generator with 3 armatures at 120 degrees to one another.
patching
slider panels(manual) plug panels(manual) dimmer per circuit(electronic patch)
control boards
manual preset computer
single phase
2H 1N
3 phase
3H 1N
20 amps
how much amps is in each dimmer?
current increases
as voltage increases
current decreases
as resistance increases