EEP321L
Electrical Apparatus and
Devices Lab
SERIES AND
PARALLEL
CONNECTIONS
Members
Kenneth Mowen D. Ramos
Edzel C.Rivera
James Patrick V. Rosales
Louis Neil S. Ruiz
Ivy Bren Sibal
Adrian Simeon
Rdiii R. Tal Placido
Aaron John A. Yalung
Keneth Zapanta
3
GROU
P
OBJECTIVES
When you have completed this assignment, you will learn:
 know the effect on power output when the secondary
windings are connected in series,
 know the effect on power output when the secondary
windings are connected in parallel.
DATA (Practical 3.2 - Results
Table)
Primary Voltage Primary Current
Secondary
Secondary Current
Load(Ω)
(V)
(A)
Voltage
“PARALLEL”
(A)
(V)
230
0.38
120
0.66
182
DATA (Practical 3.2 - Results
Table)
Primary Voltage Primary Current
Secondary
Secondary Current
Load(Ω)
(V)
(A)
Voltage
“SERIES”
(A)
(V)
230
0.43
235
0.37
640
At secondary side, the terminal
voltage of series connection is
greater than the terminal voltage of
parallel connection. The load current
of parallel connection is greater than
the terminal voltage of parallel
connection. The transformer is rated
in which our calculated output power
must not exceed to its rating in both
series and parallel connection. Based
in calculation, this condition is
satisfied. We notice that the parallel
connection is more capable in
supplying large power than a series
connection.
ON
s
Question 3.1 Referring to the parallel connection
test, we could disconnect one of the secondary
windings and still supply power to the two banks of
load resistors. The voltage and current would be
only a little less than those obtained with both
windings connected. What would be wrong with
doing this?
It is possible we can only obtain a
minimum amount of voltage and current but
still the system will supply power. The only
problem is that when the other secondary
winding disconnected, increase in power
consumption of the load connected to that
transformer. That is why the transformer
becomes overload.
Conclusi
on
After completing the laboratory, we completely
observed the effects on power output when the secondary
windings are connected in series and parallel connection. In
which, we can conclude that, if we want to get twice the
voltage at the output, we can connect two secondary
windings in series, provided that the current will remain
constant. But if we want to add up some current, parallel
connection transformer is more reliable in terms of getting
higher power output and current. We clearly see in our
observation and calculation. In our further research,
practically the parallel transformers are more commonly
used because of its ability to change output power. One
thing that should be taken care of is that while connecting
two windings with each other. If the terminals with opposite
phase relationships are connected with each other, they will
cancel each other, hence we won’t get any output.
THANK