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Cuprous oxide (red) Formula Molecular weight Physical appearance Cu2O 143.08 Red to reddish brown powder
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Experiments with photovoltaic cells
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In this project we will be performing a range of experiments with photovoltaic cells that allow us to learn something about their characteristics and how they perform in different applications. The experiments in this project could form a great basis of a science fair stand or poster display.
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Project 22: Experimenting with the Current Voltage Characteristics of a Solar Cell Project 22: Current Voltage Characteristics
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Light source Photovoltaic cell Voltmeter Ammeter Variable resistance Graph paper and pencil Figure 10-21 Circuit to determine the current voltage curve of a single solar cell.
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We can learn a lot about solar cells electrical characteristics by plotting the current voltage curve of the device. To carry out the experiment, we will need to ensure that the solar cell receives constant illumination all the time. Use a bright lamp, and position it a fixed distance above the solar cell. Set up the circuit as shown in Figure 10-21. We are now going to adjust the variable resistor from one extreme to the other, noting how the readings on the voltmeter and ammeter change as we do so. At this point you need to make careful notes as to the current and the voltage at each stage. You can do this on paper, or, if you have a PC handy, on a spreadsheet. Try and take at least 15 or so different readings to help you plot an accurate curve.
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Now plot the points on your graph paper, or by using the chart wizard on a spreadsheet program. Compare your graph to Figure 10-22. The graph tells us how the solar cell will perform when different loads are applied.
Figure 10-22 Current voltage characteristics of a single solar cell.
Project 24: Experimenting with Solar Cells
Project 23: Experimenting with Current Voltage Characteristics of Solar Cells in Series
You will need
Light source Three photovoltaic cells Voltmeter Ammeter Variable resistance Graph paper and pencil Figure 10-23 Circuit to determine the current voltage curve of solar cells in series.
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Now we are going to repeat the experiment above, but we are going to do it three times. Set up the circuit as shown in Figure 10-23. First using one cell, then two, then three. You can reuse your result for above for the single solar cell, but we are now going to add two additional lines to our graph one for two solar cells connected in series, and another for three solar cells in series. What can we see from the results (Figure 10-24) Well, it is clear that when we add multiple solar cells in series, the voltages add up. However, the current produced remains the same.
Figure 10-24 Current voltage curve of solar cells connected in series.
Project 24: Experimenting with Solar Cells in Parallel
Ammeter Variable resistance Graph paper and pencil
You will need
Light source Three photovoltaic cells Voltmeter
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Figure 10-25 Circuit to determine the current voltage curve of solar cells in parallel.
We are now going to connect solar cells in parallel and repeat the experiment.
Project 25: The Inverse Square Law
Again, we will end up with a graph with three lines. Make a prediction now! How do you expect this graph to differ from the one when we connected solar cells in series The solar cells will be connected in accordance with Figure 10-25. First connect one cell, then two in parallel, then three! Now plot the graph from the points that you obtained (Figure 10-26) and compare it to Figure 10-24.
Figure 10-26 Current voltage curve of solar cells connected in parallel.
How do the two graphs differ Well, it can be seen that in the parallel plots, the voltage remains the same throughout, and it is the current that changes contrast this to the series experiment where it was the voltage that changed.
Project 25: Experiment with the Inverse Square Law
You will need
the amount of received light is equal to the inverse of the square of that distance (Figure 10-27). As we are trying to measure the light only from a point source, it is a good idea if you can try and do this in a darkened room. Take a single solar cell, and connect a voltmeter and ammeter across its terminals. We are going to move the light away and measure the voltage and the current produced. Remember, it is easy to find the total power produced by multiplying the voltage and the current together. Compare the power generated, to the distance that the light source is from the solar cell. Plot this in a copy of Table 10-2. What do we learn about the
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