<s>
Critical	B-Algorithm
field	I-Algorithm
resistance	I-Algorithm
is	O
a	O
term	O
that	O
is	O
associated	O
with	O
a	O
shunt	B-Algorithm
DC	I-Algorithm
generator	I-Algorithm
.	O
</s>
<s>
In	O
a	O
DC	O
shunt	B-Algorithm
generator	I-Algorithm
,	O
the	O
voltage	O
induced	O
across	O
the	O
armature	O
,	O
Va	O
,	O
is	O
directly	O
proportional	O
to	O
the	O
flux	B-General_Concept
acting	O
across	O
it	O
,	O
The	O
flux	B-General_Concept
in	O
a	O
DC	O
generator	O
is	O
directly	O
proportional	O
to	O
the	O
field	O
current	O
,	O
If	O
.	O
</s>
<s>
The	O
critical	B-Algorithm
field	I-Algorithm
resistance	I-Algorithm
is	O
defined	O
as	O
the	O
maximum	O
field	O
circuit	O
resistance	O
(	O
for	O
a	O
given	O
speed	O
)	O
with	O
which	O
the	O
shunt	B-Algorithm
generator	I-Algorithm
would	O
just	O
excite	O
.	O
</s>
<s>
The	O
shunt	B-Algorithm
generator	I-Algorithm
will	O
build	O
up	O
voltage	O
only	O
if	O
field	O
circuit	O
resistance	O
is	O
less	O
than	O
critical	B-Algorithm
field	I-Algorithm
resistance	I-Algorithm
.	O
</s>
