© 2000, 2003 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
G
ETTING
S
TARTED WITH THE
CBL 2™ S
YSTEM
67
Teacher Information
The reason for using pennies minted prior to 1983 is that the U.S. Treasury started
making the zinc copper-clad pennies that year.
The washers can be any zinc washer from the hardware store.
The 4-hour period used for the long-term example can be changed, although the
time period selected must be long enough to record a change in the voltage of the
battery. A couple of hours should be fine.
The distance between the penny and washer for all of the batteries needs to
remain constant. A change in distance will affect the voltage.
Sample Answers
1.
The open voltage or control will usually read close to zero. The reason it may
not is due to the nature of the internal workings of the CBL 2.
2.
Table of batteries used for this sample data:
Name of the fruit
Number
Voltage
control
0
0.03
potato
1
0.99
banana
2
1.01
tomato
3
1.01
orange
4
1.04
lemon
5
1.05
3.
4.
0.03
5.
lemon (1.05 volts)
6.
potato (0.99 volts)
7.
Yes, they tended to change color. The penny gets shinier and the washer
tarnishes.
Содержание CBL 2
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