What is the efficiency of a photovoltaic cell?
The correct answer is D: The relative fraction of light that is converted to current. What is the efficiency of a photovoltaic cell is the relative fraction of light that is converted to current. Efficiency is the percentage of light converted to electrical current. For amateur radio operators, this is important for photovoltaic knowledge. Understanding this helps when evaluating solar cells.
Exam Tip
Photovoltaic cell efficiency = relative fraction of light converted to current. Think 'P'hotovoltaic 'E'fficiency = 'P'ercentage of 'E'nergy converted (light to current). Efficiency is the percentage of light converted to electrical current. Not RF/DC power, not lumens/power, not voltage/current - just light to current conversion.
Memory Aid
"Photovoltaic cell efficiency = relative fraction of light converted to current. Think 'P'hotovoltaic 'E'fficiency = 'L'ight to 'C'urrent. Efficiency is the percentage of light converted to electrical current. Important for photovoltaic knowledge."
Real-World Application
The efficiency of a photovoltaic cell: It's the relative fraction of light that is converted to current. For example, if 20% of the light energy is converted to electrical current, the efficiency is 20%. This is what efficiency is - light to current conversion.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Output RF power divided by input DC power isn't efficiency - efficiency is light converted to current. RF/DC power isn't efficiency.
Option B: Incorrect. Output in lumens divided by input power isn't efficiency - efficiency is light converted to current. Lumens/power isn't efficiency.
Option C: Incorrect. Open-circuit voltage divided by short-circuit current isn't efficiency - efficiency is light converted to current. Voltage/current ratio isn't efficiency.
题目解析
The correct answer is D: The relative fraction of light that is converted to current. What is the efficiency of a photovoltaic cell is the relative fraction of light that is converted to current. Efficiency is the percentage of light converted to electrical current. For amateur radio operators, this is important for photovoltaic knowledge. Understanding this helps when evaluating solar cells.
考试技巧
Photovoltaic cell efficiency = relative fraction of light converted to current. Think 'P'hotovoltaic 'E'fficiency = 'P'ercentage of 'E'nergy converted (light to current). Efficiency is the percentage of light converted to electrical current. Not RF/DC power, not lumens/power, not voltage/current - just light to current conversion.
记忆口诀
Photovoltaic cell efficiency = relative fraction of light converted to current. Think 'P'hotovoltaic 'E'fficiency = 'L'ight to 'C'urrent. Efficiency is the percentage of light converted to electrical current. Important for photovoltaic knowledge.
实际应用示例
The efficiency of a photovoltaic cell: It's the relative fraction of light that is converted to current. For example, if 20% of the light energy is converted to electrical current, the efficiency is 20%. This is what efficiency is - light to current conversion.
错误选项分析
Option A: Incorrect. Output RF power divided by input DC power isn't efficiency - efficiency is light converted to current. RF/DC power isn't efficiency. Option B: Incorrect. Output in lumens divided by input power isn't efficiency - efficiency is light converted to current. Lumens/power isn't efficiency. Option C: Incorrect. Open-circuit voltage divided by short-circuit current isn't efficiency - efficiency is light converted to current. Voltage/current ratio isn't efficiency.
知识点
Efficiency, Photovoltaic cell, Relative fraction of light, Converted to current
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.