Download Reference Points with a Series Parallel Circuit

Reference Points with a
Series Parallel Circuit
2324A-8 Series-Parallel Circuits
with Reference Points added in
Voltages Test Points listed for
Series Parallel Circuit
Voltage is Always Relative
When someone asks you
“What is the voltage at point
“C”?
• What do you tell them?
• Do you have enough
information to answer their
question?
• If so, what is the answer?
• If not, what else do you
need to know?
• How many leads does a Volt
Meter have?
• How do you measure the
voltage at point “C”?
Series Parallel Circuit with
Voltages listed
• As you know, a Volt Meter
has two leads.
• One is Positive
• The other is Negative
• You did not have enough
information to answer the
question.
• You need to know what is
your reference point.
• You have eight points that
you could use as reference
points.
• You could use points “A”,
“B”, “D”, “E”, “F”, “G”, “H”
and “I”.
Let us use Point “F” as
the Reference Point.
•
Now, where? do you place your
Volt Meter Leads
• The negative lead (Black Lead)
goes to Point “F”. (Reference)
• The positive lead (Red Lead)
goes to Point “C”. (Point of
Measurement)
Series Parallel Circuit with
Voltages listed
• What are we going to
measure?
• Is the voltage going to
be positive or negative?
• Do we go clockwise or
counterclockwise to
determine the voltage?
• What are the first steps
we need to do?
• Pay attention to the
givens
• This is a Parallel Branch
• The Voltage is a given
What is the voltage drop/measurement?
VR2 = 60.45mV
Wired circuit on the updated PTL3
What does point “E” measure
with reference to Point “A”?
• Go counter clock wise from
Point “E”. -60.45mV + 14.93V = -14.99V
• Go clock wise from Point “E”.
• 7.62m + -15 = -14.99238V
or about -14.99V
• What does point “A” measure
with reference to Point “H”?
• Go counter clockwise from
Point “A”. 15V = the Source
What does point “F” measure
with reference to Point “E”?
• This is not a trick question.
There are times when you
may not be aware of the
common points in the
circuit.
• This is especially true for
large complex circuits.
You should measure/ read 0V.
• What does point “A” measure
with reference to Point “B”?
• Go clockwise from Point “A”
= 14.93V
• Go CCW from B; -60.45m +
-7.62m + 15 = about 14.93V
Questions?
The End.
Developed and Produced by the
Instructors in the CIE Instruction
Department.
© Copyright 12/2011
All Rights Reserved / Dec. 2011