Electrotechnics N6 Student's Book
eBook - PDF

Electrotechnics N6 Student's Book

TVET FIRST

SA Chuturgoon

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eBook - PDF

Electrotechnics N6 Student's Book

TVET FIRST

SA Chuturgoon

Book details
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Table of contents
Citations

About This Book

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.

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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
=
+
=
‚Ȇ
=
=
ÔĀõ
Important 
‚ÄĘ
All 
given 
powers 
in 
a 
question 
are 
taken 
as 
power 
output 
(
P
o
) 
unless 
otherwise 
stated. 
‚ÄĘ
For 
a 
motor: 
i
L
o
mechanical 
power
P
VI
P
=
=
‚ÄĘ
For 
a 
generator: 
i
o
L
mechanical 
power
P
VI
P
=
=
‚ÄĘ
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: 
‚ÄĘ
Two 
specific 
formulae 
(one 
for 
motors 
and 
one 
for 
generators). 
‚ÄĘ
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