Casio EA-200 - Manual (Page 39)

20020601
English
Activity: Operating the Equipment Activity: Operating the Equipment Measurement Measurement
2-13-2
u If the variation in voltage becomes small, use the pipette with a bulb to inject a small
amount of hydrogen peroxide into the dilute sulfuric acid around the copper plate.
u Repeat this process as you monitor the life of the battery.
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í Measuring Data
u The voltage is displayed on the calculator.
u Lower the arm of the stand so the metal plates are submersed in the dilute sulfuric acid
solution, without coming into contact with the cistern.
í Calculator Operation
u The voltage is measured and displayed using the Voltage Measurement Setup.
u Find the applicable program in the Program Library (P.2-16-4), input it into your calculator,
and then run it.
u Compare the initial voltaic battery electromotive force with the theoretical value of
1.1V.
u Try changing the surface area of the two electrodes that is in contact with the dilute
sulfuric acid solution, and note any changes in the electromotive force.
u Find out what you can about the Daniel Cell, which is one type of battery that is not
prone to loss of voltage due to hydrogen build-up on the positive electrode.
u Perform long-term measurement of a commercially available manganese battery
(5V maximum) and determine its useful life.
1 Stand Arm
2 Cistern
3 Copper Plate
4 Pipette with a bulb
5 Hydrogen Peroxide
6 Hydrogen Foam
7 Hand
1 Stand Arm
2 Cistern
1 Hydrogen Peroxide
Added Here
V (V) : Voltage
t (s) : Time