Characteristic Curves of the Electrolyser
Name: 黃舜韋
Student ID MA410113
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
0.016
Current mA
0.03
0.018
0.05
0.022
0.12
0.023
0.2
0.024
0.25
0.025
0.35
0.025
0.50
0.026
0.85
0.030
1.50
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Evaluation
 Draw the VI characteristic curve of the electrolyser.
0.035
0.03
0.025
0.02
V
0.015
IV
0.01
0.005
0
0
0.5
1
1.5
I
 Interpret the IV characteristic curve.
隨著供應的電流 Current 越高，電壓 Voltage 也就越高。
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2
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
100
Voltage V
0.831
Current mA
0.008
Power mW
0.006648
50
0.820
0.017
0.01394
20
0.801
0.038
0.030438
10
0.782
0.076
0.059432
5
0.757
0.145
0.109765
3
0.742
0.194
0.143948
2
0.715
0.284
0.20306
1
0.443
0.343
0.151949
0.5
0.214
0.314
0.067196
0.3
0.382
0.340
0.12988
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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.
VI
0.9
0.8
0.7
0.6
0.5
V
0.4
0.3
0.2
0.1
0
VI
0
0.1
0.2
0.3
0.4
I
 Interpret the characteristic curve.
電阻 Ω 越小，電壓 Voltage 會越小，電流 Currentu 也會越大。
因為 P=IV，所以電耗 POWER 也同樣越大。
但可能實驗器材的儀表或線路接觸不良等等，導致數據出現了回朔的現象。
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Table of measurements (connected in series)
Resistance Ω
100
Voltage V
1.654
Current mA
0.016
Power mW
0.026464
50
1.598
0.034
0.054332
20
1.519
0.074
0.112406
10
1.407
0.138
0.194166
5
0.718
0.142
0.101956
3
0.495
0.143
0.0693
2
0.374
0.145
0.05423
1
0.173
0.150
0.02595
0.5
0.095
0.142
0.01349
0.3
0.081
0.145
0.011745
Evaluation
 Draw a diagram of the characteristic curves for the fuel cells connected in series and parallel and compare
the two curves.
VI
1.8
1.6
1.4
1.2
1
0.8
V
0.6
0.4
0.2
0
VI
0
0.05
0.1
0.15
0.2
I
 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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P=IV
0.25
0.2
connected in
series
0.15
0.1
P=IV
0.05
0
0
0.05
0.1
0.15
0.2
connected in parallel
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0.25