|
Customer Support:
If you are experiencing a problem with one of our products or have any
question when using a product, please email us at support@ibotz.com
Newsletter:
We also a free newsletter which we can e-mail or post to you each
quarter. To subscribe please send us an e-mail below with the word
"post" or "e-mail" and we will add you to our
subscriber list. Please email us at newsletter@ibotz.com |
|
|
 |
Charge Sensor |
Charge Sensor
Order Code:
CRG-BTA |
For LabQuest, LabPro,
and Go! Link |
 |
|
 |
The Charge Sensor is automatically
detected when connected.
|
 |
The Charge Sensor is used in 1 innovative use [more info]
|
|
The Charge Sensor is used as an electronic
electroscope. Unlike a traditional electroscope,
the Charge Sensor can make quantitative
measurements. Numerical measurements improve
many electrostatics experiments such as charging
by induction, charging by friction, and charging
by contact. The sensor can also be used to
measure charge polarity.
An extremely high impedance voltage sensor
with a 0.01µf input capacitor makes these
measurements possible. The sensor has three
operating ranges and a zeroing switch to
discharge the input capacitor.
A special low-leakage BNC/Alligator clip
cable is included.
Ranges:
± 0.5 V (+/- 5 nC)
± 2 V (+/- 20 nC)
± 10 V (+/- 97 nC)
Typical bias current = 0.005pA
Input Capacitance: 0.01 µF
User Guide
| Ordering
Information |
| |
Charge Sensor
|
CRG-BTA
(For LabQuest,
LabPro, and Go! Link)
|
Question
What types of activities can I
perform with the Charge Sensor?
Answer
You can easily demonstrate charging
mechanisms. For example you can simply
comb your hair and touch the red lead of
the sensor with the comb. You will
observe an increase in sensor reading.
If you repeat the process, you will note
the reading increase with each touch.
Other good examples include the charging
of a Styrofoam cup by simply handling
it, or the charging of an electrophorus,
which can be made out of an aluminum pie
plate.
As you work with the sensor, you may
notice that you personally carry charge.
It may be necessary for you to ground
yourself before carrying out experiment.
You may want to demonstrate this to your
students.
You can demonstrate charging by
induction. Place two soda cans on a
glass plate. Ground one of the cans and
charge the other can. Bring the charged
can near the grounded can and remove the
ground. Now use the sensor to explore
the charge on the previously grounded
can.
You can demonstrate charging by contact.
An excellent demonstration can be
performed with Scotch™ Magic™ tape.
Obtain two 5-cm pieces of magic tape.
Fold the top of one into a point. Fold
the top of the other one over straight.
Put the one with pointed top on top of
the other tape with the sticky side of
the pointed tape on top of the smooth
side of the straight folded tape. With
the two pieces of tape stuck together,
ground the tape. Show that they have no
charge by moving them near the red lead
of the charge sensor, which is held out
in space by an insulator. Now pull the
two pieces of tape apart. Move each
piece near the red lead of the charge
sensor and show they are charged in
opposite ways. Now, put the two pieces
of tape back together. Move the
combination near the red lead and show
that the combination is not charged.
Make an Al foil ball and suspend it
between two cans with a bifilar support.
Clip the red Charge Sensor lead to one
can, which has been grounded. Charge the
other can and let the foil ball bounce
back and forth between the two cans as
you watch the charge increase on the can
with the red lead.
Demonstrations can be performed with an
inexpensive Faraday Pail, which is an
excellent way to do some qualitative
studies. To make the pail, cut the top
off an Al foil can and put plastic
electrical tape on the sharp part of the
can. Charge up bits of foam by tearing
up a Styrofoam foam cup. Attach the red
lead of the Charge Sensor to the pail.
Drop pieces of the foam into the pail
and watch the charge build up. Drop
pieces of foam of various sizes into the
pail. Notice that they have different
size charges. Dump the foam out and show
that no charge has been transferred to
the pail.
The Scotch Tape described above can be
used with Faraday Pail. Make multiple
sets of tapes and then drop the pointed
ones in one at a time to show that each
one has the same amount of charge. Then
drop the blunt tapes in one at a time to
show a decrease in the charge with each
tape. You could even try tapes of
differing length to show different
amounts of charge.
Here is another demonstration similar to
the one mentioned above. Charge up a
piece of foam and put a penny on it.
Touch the penny to induce a charge on
it, and place the penny in the pail.
Repeat the process with other pennies
and watch the charge build up. Finally
dump out the pennies and observe that
charge has been transferred to the pail.
Another activity for use with the
Faraday Pail involves a “proof
plane”. Build a proof plane out of an
insulator with a coin at the end. Charge
the proof plane and touch it to the
inside of the pail which has the red
lead attached. Observe the charge build
up.
You can demonstrate the discharging of
an object. Charge the red lead of the
Charge Sensor. Now connect it to dry
thread which is attached to ground.
Collect data as a function of time to
monitor the discharging of the sensor.
Repeat the experiment with thread
moistened in distilled water and thread
moistened in salt water. Compare the
discharge rates. |
|
NOTE: All Vernier products are designed for
educational use only. Our equipment is not designed or
recommended for research or any apparatus involved with
any industrial or commercial process such as life
support, patient diagnosis, control of a manufacturing
process, or industrial testing of any kind. More
information.
|
|
|
|
