What is the approximate open-circuit voltage produced by a fully illuminated silicon photovoltaic cell?

Answer: A. 0.5 volts

A fully illuminated silicon photovoltaic cell produces about 0.5 volts open circuit. Cells are connected in series to reach useful voltages. Note 0.7 V is a diode forward drop, not a solar cell output.

Tip: One silicon solar cell: about half a volt.