Learning to Use the Voltage Probe

Learning to Use the Voltage Probe
Computer
40
Learning to Use a Voltage Probe
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A Voltage Probe can measure the voltage of a battery. This is one way of checking
whether a battery is good. In this activity, you will learn about the Voltage Probe by
working with a battery.
OBJECTIVES
•
•
•
Learn to use the Voltage Probe.
Measure the voltage of a battery.
Match patterns on the computer screen.
MATERIALS
co
In this activity, you will
ua
tio
n
computer with Logger Lite software installed
Go! Link interface
Vernier Differential Voltage Probe
battery
ruler with center groove
PROCEDURE
Part I
Learn About the Voltage Probe
al
1. Make sure the Voltage Probe is plugged into the Go! Link and that the Go! Link is
attached to the computer.
Ev
2. Start Logger Lite on your computer. If everything is attached correctly, the LED on
the Go! Link will be green and the Logger Lite screen will display a graph, a data table,
and a digital meter.
3. Open the file for this activity by doing the following:
a. Click the Open button,
.
b. Open the folder called “Elementary Science.”
c. Open the file called “40a Voltage Probe.”
Elementary Science with Vernier
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Computer 40
4. Look at the materials you will be using in this activity.
a. Pick up the battery. Do you know which end is the positive end and which is the
negative? Make sure everyone in your group agrees upon which is which and put the
battery in the groove in the ruler.
b. Now, look at the clips of the Voltage Probe. You will be touching the metal tips of
these clips to the ends of the batteries later on.
5. Zero the Voltage Probe.
a. Clip together the ends of the red and black wires coming from the Voltage Probe.
to zero the Voltage Probe. The
b. Look at the computer screen and click
voltage reading on the screen should be at or near 0 V.
c. Disconnect the clips.
6. Collect data using the Voltage Probe by following the steps below. After you collect
data, you will record your observations, so be sure to pay close attention!
a. Look at the computer screen and click
to start data collection.
b. Touch the two Voltage Probe clips together. Notice if anything happens to the
voltage values.
c. Now, touch the black clip to the positive end of the battery (the side with the
bump) and the red clip to the other end, and hold them for a few seconds. Are the
voltage values negative?
d. Finally, switch the clips around so the red clip touches the positive end of the
battery and the black clip touches the negative end. Are the voltage values negative
now?
e. Click
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to end data collection, if it has not stopped already.
Elementary Science with Vernier
Learning to Use a Voltage Probe
7.
On the Observations Sheet below, write down what happened when you were collecting
data.
Observations Sheet
1.
When I touched the two clips together, the voltage
2.
When I touched the black clip to the positive end of the battery and the
red clip to the negative end of the battery, the voltage
3.
When I touched the red clip to the positive end of the battery and the
black clip to the negative end of the battery, the voltage
Part II
8.
Matching Patterns with the Voltage Probe
Open the file for this activity by doing the following:
a. Click the Open button,
.
b. Open the file called “40b Match This.”
Elementary Science with Vernier
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Computer 40
9. In this part of the activity, you will complete writing the steps necessary to match the
pattern on the graph. Think about how you would do this and fill in the blanks below.
Note: Your voltage readings might not match the pattern, exactly. It is most
important to make the pattern similar to that on the graph, rather than reach the
same voltages.
a. Start with the red clip touching the _________________ (positive or negative)
(positive or
end and the black clip touching the
negative) end of the battery. (Tip: The Meter window on the screen displays live
voltage readings. Use these to help you decide where to touch the clips.)
b. Keep the clips in this position for
seconds.
c. Quickly, touch the clips together and hold them there for
d. Quickly, touch the red clip to the
seconds.
(positive or negative) end and the
seconds.
black clip to the other end and hold them there for
e. Quickly, touch the clips together and hold them there for
seconds
until data collection ends.
10. Click
and follow the steps you wrote in Step 9.
11. If your data matches the original pattern, congratulations! If you want to try again,
repeat the steps you wrote in Step 9.
Good job!!
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Elementary Science with Vernier
Vernier Lab Safety Instructions Disclaimer
THIS IS AN EVALUATION COPY OF THE VERNIER STUDENT LAB.
This copy does not include:
z
Safety information
z
Essential instructor background information
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Directions for preparing solutions
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Important tips for successfully doing these labs
The complete Elementary Science with Vernier lab manual includes 43 labs and essential
teacher information. The full lab book is available for purchase at:
http://www.vernier.com/cmat/ewv.html
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