52 terms

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