Question
What is the efficiency of a photovoltaic cell?
Answer Options
- A) The output RF power divided by the input DC power
- B) The output in lumens divided by the input power in watts
- C) The open-circuit voltage divided by the short-circuit current under full illumination
- D) The relative fraction of light that is converted to current
Correct Answer: D
Explanation
The efficiency of a photovoltaic (solar) cell is a measure of its performance as an energy converter. Like any efficiency metric, it is the ratio of useful energy output to the energy input. The primary challenge in a solar cell is converting the energy content of the incident light into electrical energy.
Therefore, the efficiency of a photovoltaic cell is the relative fraction of light that is converted to current (or electrical power). It is formally calculated as the maximum electrical output power divided by the power of the incident solar radiation, expressed as a percentage. This metric is the standard way to compare the performance of different solar cell technologies.
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