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Electrical Applications 2 by David W. Tyler

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56
Materials
and their
applications
in the
electrical
industry
ΔΦ
Using symbols:
e =
the Greek
Δ
(delta) being read
as 'the
change
in\
Considering
the
core
as a
single turn, when
an
alternating current
flows
in the
coil
in
Figure
4.25, the
time interval
for a
current
to
change from zero
to a
maximum
or
from
a
maximum
to
zero
etc.,
with
the
corresponding changes
in
core flux,
is a
function
of
fre-
quency.
The
greater
the
frequency
the
smaller
is the
time interval