Easy to follow with clear explanations, photographs and diagrams to aid understanding. Includes numerous worked examples and varied activities to consolidate students' knowledge. Summaries plus summative assessments modelled on exams are included after each module to ensure students' success.
- 280 pages
- English
- PDF
- Available on iOS & Android
eBook - PDF
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Information
Shunt
motor
formulae:
L
a
f
f
f
a
a
i
L
o
(To
be
explained
later.)
mechanical
power
I
I
I
V
I
R
V
I
R
P
VI
P
=
+
=
≠
=
=
Important
•
All
given
powers
in
a
question
are
taken
as
power
output
(
P
o
)
unless
otherwise
stated.
•
For
a
motor:
i
L
o
mechanical
power
P
VI
P
=
=
•
For
a
generator:
i
o
L
mechanical
power
P
VI
P
=
=
•
Note
that
we
are
not
giving
you
a
formula
to
calculate
mechanical
power.
1.1.2
Emf
equations
for
a
DC
machine
You
will
encounter
three
emf
equations
in
this
module:
•
Two
specific
formulae
(one
for
motors
and
one
for
generators).
•
One
general
formula
(for
all
DC
machines).
Specific
emf
equations
The
two
specific
formulae
are
derived
using
Kirchhoff’s
voltage
law,
which
states
that:
The
sum
of
the
applied
(or
generated)
emfs
is
equal
to
the
sum
of
all
the
voltage
drops
in
any
closed
circuit.
OR
The
algebraic
sum
of
all
voltages
around
a
closed
loop
in
a
circuit
is
equal
to
zero.
Table
1.1
shows
how
the
two
specific
emf
equations
are
derived.
Table of contents
- Front Cover
- Title Page
- Imprint Page
- Contents
- Module 1: Direct-current (DC) machines
- Module 2: Alternating current (AC) circuit theory
- Module 3: Transformers
- Module 4: Synchronous machines
- Module 5: Polyphase induction motors
- Module 6: Power factor correction
- Module 7: Generation and supply of AC power
- Abbreviations and symbols
- Short answers
- Glossary
- Back Cover
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