Characteristic Curves of the Electrolyser
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Experimental layout
 Vary the light intensity to adjust the current of the solar module. Set different current value, starting at
small currents of approx. 30 mA and going up to approx. 800 mA (depending on the type of lamp used;
with DC power supply up to about 3 amps). Also record the electrolyser’s voltage. Take at least 8 pairs of
measurements of electrolysis current and voltage and record the measurements.
Table of measurements
Voltage V
Current mA
1.66
31
1.81
80
2.22
154
2.56
191
2.66
230
2.7
255
2.76
302
2.81
350
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Evaluation
 Draw the VI characteristic curve of the electrolyser.
 Interpret the IV characteristic curve.
隨著電源供給的電流上升，電壓也跟著上升。
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Characteristic Curves of the Fuel Cell
Connected in parallel and in series
Fuel cells connected in parallel
Fuel cells connected in series
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 Adjust the rotary switch on the load module to “OPEN”.
 Make sure that both of the electrolyser’s gas storage cylinders are filled with distilled water up to the 0 ml
mark.
 Use the tube clips to close the two short tubes at the gas outlets of the fuel cell.
 Interrupt the connection between the solar module and the electrolyser when the 60 ml mark is reached
on the hydrogen side of the electrolyser.
 Measure the characteristic curve of the fuel cell by varying the measurement resistance (rotary switch on
the load module).Start at position “OPEN” (open-circuit voltage), then decrease the resistance step by
step by turning the rotary switch to the right. Record the current and voltage and each switch position.
Wait for 30 seconds each time before taking the measurement.
 After recording the characteristic curve, reset the rotary switch on the load module to “OPEN” and
remove the clip at the fuel cell.
Table of measurements (connected in parallel)
Resistance Ω
Voltage V
Current mA
100
0.84
8
Power mW
6.72
50
0.82
16
13.12
20
0.79
37
29.23
10
0.76
72
54.72
5
0.73
135
98.55
3
0.72
180
129.6
2
0.69
244
168.36
1
0.59
443
261.37
0.5
0.445
572
254.54
0.3
0.264
880
232.32
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Evaluation
 Draw the VI characteristic curve of the fuel cells connected in parallel.
 Enter the voltage and current of the lamp into the VI characteristic curve.
 Interpret the characteristic curve.
當燃料電池並聯時，透過改變電阻，從 100 Ω 開始逐漸下降，電壓與電流也隨之下 降
在 3 歐姆 2 歐姆 較為穩定，在電組降至 1 Ω 時，就與之前有明顯的差值
相較為不穩定在崩潰邊緣。
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Table of measurements (connected in series)
Resistance Ω
Voltage V
Current mA
Power mW
100
1.727
17
29.359
50
1.67
35
58.45
20
1.59
77
122.43
10
1.498
143
214.214
5
1.36
263
357.68
3
1.266
337
426.642
2
1.153
470
541.91
1
0.837
837
700.569
0.5
0.596
1192
710.432
0.3
0.376
1253
471.128
Evaluation
 Draw a diagram of the characteristic curves for the fuel cells connected in series and parallel and compare
the two curves.
Pseries
series
Pparallel
parallel
 Draw the PI diagrams for the fuel cells connected in series and parallel. Calculate the power consumption
of the lamp and enter the values into the PI diagrams.
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