44
G
l
o
ssar
y
of
T
e
r
m
s
AC
A
l
ternating
Current
B
T
U
/
H
B
ritish
T
herma
l
U
nits
CO
Carbon
M
ono
x
ide
CO2
Carbon
Dio
x
ide
DC
Direct
Current
DS
I
Direct
Spark
I
gnition
E
CO
E
nergy
Cut
Off
G
FI
G
round
fau
l
t
interrupt
G
P
M
G
a
ll
ons
per
M
inute
H
z
H
ert
z
L
E
D
L
ight
E
mitting
Diode
N
O
x
O
x
ides
of
N
itrogen
N
P
T
N
ationa
l
Pipe
T
hread
PS
I
Pounds
per
S
q
uare
I
nch
RP
M
Revo
l
utions
per
M
inute
V
A
V
o
l
t
Amps
V
AC
V
o
l
ts
A
l
ternating
Current
W
.
C
.
I
nches
of
W
ater
Co
l
umn
°
C
Degrees
Centigrade
°F
Degrees
F
ahrenheit
A
M
icro
Amp
N
o
tes
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