Sunlight (solar radiation) may be turned directly into electricity using ________ cells

Question

BlackTom AI · Accepted Answer

The question asks about converting sunlight directly into electricity and provides four options. 
Option 1: electrolytic. This term is associated with electrolysis, where electrical energy drives a chemical reaction to split compounds (e.g., splitting water into hydrogen and oxygen). It is not a direct conversion of light into electricity, so this option describes a process that uses electricity rather than producing it from light. 
Option 2: photovoltaic. This term refers to devices (solar cells) that convert photons from sunlight directly into electrical energy via the photovoltaic effect in semiconductors. This is exactly the direct conversion of solar radiation to electricity, matching the question precisely. 
Option 3: lead-acid. Lead-acid relates to a rechargeable battery chemistry. Batteries store electrical energy and release it later; they do not convert light directly into electricity when exposed to sunlight, so this option does not answer the prompt. 
Option 4: fuel. In the context of energy systems, fuel cells or fuels are involved in chemical energy conversion, producing electricity from a chemical reaction with a fuel source. This still requires a chemical process after energy is released, not a direct light-to-electricity conversion, so it does not fit the question. 
In summary, only photovoltaic cells directly convert sunlight into electricity, while the other options describe processes or devices that either use electricity, store energy, or rely on chemical reactions rather than direct light-to-electricity conversion.

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