The document describes a lab experiment on circuit analysis conducted by students at George Washington University. The objectives are to construct and analyze series and parallel circuits using resistors and diodes. Students will use a breadboard, power supply and multimeter to build circuits matching given diagrams and measure voltages to verify circuit behavior based on Ohm's Law calculations of current and resistance values.
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It includes it's symbolic representations, history, types and it's working, applications of Voltmeter.
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2. George Washington University
Objectives
Constructing a Series Circuit
Ohm’s Law Review
Breadboard Overview
DC Power Supply Review
Measuring the D.C. Voltage in the Series Circuit
Multimeter Overview
3. George Washington University
Today we will build this series circuit
Series Circuit From Lecture
3V
0V
R = 1K Ω
Determine the current
Use Ohm’s Law:
V = I x R
3V = I x 1000 Ω
Solve for I:
I=3V / 1000 Ω = 3milliAmps
I = ? Amps
4. George Washington University
How to Build the Circuit
We need 5 components
3V
0V
R = 1K Ω
1) A 1K Ohm Resistor (Ask your
GTA for these materials)
2) Breadboard
3) DC Voltage Source
4) 2 sets of Banana Clip to mini-
grabber wires
I = 3mA
5. George Washington University
The Breadboard
The breadboard is building
circuits quickly without the
need for soldering
You can plug resistors and
wires right into the board
6. George Washington University
The Breadboard
The 5 holes in each row are wired
together underneath the breadboard
The rows themselves are not wired
together
The rows do not connect over the bridge
BRIDGE
The columns between the blue and
red bars are connected vertically
We typically use these as ‘power rails’
The left side we use for positive voltage
The right side we use for negative voltage
7. George Washington University
Setting up the breadboard
Plug 1 end of the 1K resistor in the
top row, on the left side of the
bridge
Plug the other end of the resistor
into the top row, on the right side of
the bridge
8. George Washington University
Setting Up the DC Power Supply
This DC Power supply is
capable of generating
voltages from -25V to 25V.
For this lab, we will be
using the 6V supply
terminals.
First, press the Power
Button to turn it on.
George Washington University
9. George Washington University
Setting Up the DC Power Supply
Press Output On/Off once to
turn on the output.
Press the +6V button to tell
the power supply that we
want to alter the output
from the 6V terminals.
Once done, your screen
should look the same as it
does on this slide.
George Washington University
10. George Washington University
Setting Up the DC Power Supply
Use the dial to increase the
display value to 3 volts as
shown.
Note: You can safely ignore
the value of the right most
digit for this experiment.
Once you have reached 3V,
Press Output On/Off once to
turn the output OFF while
you hook up the circuit.
George Washington University
This is the digit
we want to adjust
Press this arrow to
Select the
desired digit
Rotate this dial to
alter the output value.
11. George Washington University
Connecting the Power Supply to your
Circuit
Plug the ‘banana’ end of
your cables into the 6V
terminals of your power
supply
Connect the mini-grabber
ends of the cables around
your 1K resistor on the
breadboard
After attaching the mini-
grabbers to your circuit,
press the Output On/Off to
apply 3 Volts across your 1K
resistor
George Washington University
13. George Washington University
What is a Multimeter?
A tool capable of measuring a variety of different quantities.
Possible Measurements
Current (Amperes)
Resistance (Ohms)
Voltage (Volts)
14. George Washington University
How is the Multimeter different
than the Oscilloscope?
Numerical Output Displayed
Represents a complete
signal with a single value.
Measures voltage, current
and resistance.
Graphical Output Displayed
Shows how a signal changes
over time
Many only display voltage
Multimeter Oscilloscope
16. George Washington University
Taking measurements with the
Multimeter
First, we connect our wires.
One wire is always
connected to the black
terminal. This is called the
common terminal.
The red terminal is used
when measuring voltage,
resistance and small
currents.
The white terminal is used
when measuring large
currents.
TO DO: Using another set
of banana to mini-grabber
cables, connect the
banana end to the red &
black terminals
17. George Washington University
Taking measurements with the
Multimeter
Next, we turn it on and select the item to measure.
Choose from:
Current
Resistance
Voltage
Power
Button
TO DO: Since we want to
measure the voltage
across our 1K ohm resistor,
press the Voltage button
18. George Washington University
Taking measurements with the
Multimeter
Now, we select our scale.
Either select a scale appropriate for your measurement or choose AUTO
and let the multimeter select the appropriate scale for you.
Measuring the voltage from across the 1K resistor (~3V), you wouldn’t
want to choose 200mV (much too small) or 200V (much too large).
Instead, the 2V selection is more suitable.
19. George Washington University
Taking measurements with the
Multimeter
While your circuit is
attached to the power
supply…
Attach the minigrabber end
around the 1K resistor
Press the “POWER” button
on the multimeter and take
a reading!!
20. George Washington University
Building & Verifying Series Circuit #2
Resistors connected by only
1 terminal, back-to-back,
are considered to be in
‘series’
3V R2 = 1KΩ
0V
R1 = 1KΩ
Ohm’s Law States:
V(R1) = 1.5mA x 1K Ω = 1.5V
V(R2) = 1.5mA x 1K Ω = 1.5V
We are now going to build
the circuit, and verify the
voltage drops…
21. George Washington University
Setting up the breadboard
Turn off the 3V supply and disconnect
the cables
Disconnect the cables to the
minigrabbers to the multimeter
Obtain a 2nd 1K resistor
Plug one end of the resistor into a
hole in the same row as the end of
the other resistor
Plug the other end into a hole in
another row
22. George Washington University
Taking measurements with the
Multimeter
Set the Power Supply to 3V
Attach the power supply
leads as follows
Measure the voltage across
each resistor with the
multimeter
23. George Washington University
Resistors in Parallel
Resistors connected at 2
terminals, sharing the same
node on each side, are
considered to be in
‘parallel’
3V
0V
R1 = 1K Ω
The voltage is the same on
both branches of the circuit
The current will split!
It is now up to you to build
this circuit and verify the
voltages
R2 = 1K Ω
24. George Washington University
Including a Diode In the Circuit
We’ll use LEDs (Light
Emitting Diodes) for our
circuits.
3V
R1
=
1K
Ω
0V
Unlike resisters, the two diode
leads (wires) must be
connected in the correct way.
The longer lead (anode)
should be connect so that
current flows through it and to
the shorter lead (cathode).
Note: In some diodes, a stripe is used to indicate the cathode lead. Round diodes often have a
flat side, indicating the cathode.
25. George Washington University
Your Turn
1) Build the parallel circuit (in the last slide) and measure the
voltage across it
Using Ohm’s Law, what is the current through each resistor?
What is the total current in the circuit?
Show your TA your circuit, measurements, and calculations
2) In your parallel circuit, change one of the 1K resistors to a 2K
resistor
Measure the voltage across each resistor
Use Ohm’s law to determine the current through each resistor
Show your TA…
3) Rebuild the two resistor series circuit…
Change one of the 1K resistors to a 2K resistor
Measure the voltage across each resistor
Use Ohm’s law to determine the current through each resistor
Show your TA…
26. George Washington University
Your Turn
4) Build a circuit with a diode in series with a 1K resistor
Using Ohm’s Law, what is the current through the resistor?
What is the total current in the circuit?
Show your TA your circuit, measurements, and calculations
Reverse the anode and cathode connections of the diode and
observe the results.
5) Build a circuit with a diode in series with 2 parallel 1K resistors
Measure the voltage across each resistor
Use Ohm’s law to determine the current through each resistor
Show your TA…
6) Don’t forget the HW!