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Verfügbare Sprachen
Verfügbare Sprachen
The pump moves and at the same time, hydrogen and oxygen are produced in the fuel cell.
The motor and the fuel cell are connected in parallel. Both are therefore supplied with electric
energy from the solar cells and from the solar module. The energy is suffi cient to drive the mo-
tor and at the same time to produce hydrogen and oxygen.
Experiment 3:
Now wait until the hydrogen storage cylinder is around half-full and then cover up
the the solar cells and the solar module or switch off the light source.
What can you observe now? Pay attention to the hydrogen storage cylinder too.
The model runs more slowly, but it does not stop and the fuel cell consumes hydrogen.
If the light intensity reduces, the model is driven by the fuel cell. The pump now continues run-
ning, even after sunset or if the sun is concealed by a cloud.
The model now runs more slowly. This is because the fuel cell supplies a lower voltage than
the solar cells and the solar module. An electric motor rotates more slowly if it is supplied with
a lower voltage.
2 HKC_GB.indd 23
2 HKC_GB.indd 23
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13.02.2010 12:29:27
13.02.2010 12:29:27
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