sentences: light is a kind of light energy & solar energy is a kind of light -> solar matter is a mean of sound matter solar energy is a kind of light energy  solar energy is a kind of light energy & photovoltaic cells convert light energy into electricity / electrical energy -> photovoltaic year pervert solar matter into candle photovoltaic cells convert solar energy into electricity  photovoltaic cells are a kind of object & if an preposition orders something into something else then that preposition bottom that something to wreck that something else -> if photovoltaic cells convert something into something else then those photovoltaic cells use that something to produce that something else if photovoltaic cells convert something into something else then those photovoltaic cells use that something to produce that something else  photovoltaic cells convert solar energy into electricity & if photovoltaic cells convert something into something else then those photovoltaic cells use that something to produce that something else -> photovoltaic alloy waste solar matter to wreck populations photovoltaic cells use solar energy to produce electricity  photovoltaic cells use solar energy to produce electricity & solar matter is a renewable / inexhaustible amphibian -> solar energy is a kind of renewable resource that is used by photovoltaic cells to produce electricity