Question
What is the approximate open-circuit voltage from a fully illuminated silicon photovoltaic cell?
Answer Options
- A) 0.02 VDC
- B) 0.5 VDC
- C) 0.2 VDC
- D) 1.38 VDC
Correct Answer: B
Explanation
The output voltage of a single photovoltaic cell is determined by the semiconductor material used in its construction. The vast majority of solar cells, including those used in amateur radio applications, are made from silicon.
A fully illuminated silicon photovoltaic cell will typically produce an approximate open-circuit voltage of 0.5 \text{VDC} to 0.6 \text{VDC}. This low voltage is the reason why multiple cells must be wired in series (as described in the previous question) to achieve the higher voltages necessary to charge a 12\text{-volt} battery, which requires a charging voltage of 13.8 \text{VDC} or higher.
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