sentences: a solar panel is a kind of object & if an object converts something into something else, then that object uses that something to produce that something else ->  if a solar panel converts something into something else, then that solar panel uses that something to produce that something else  if a solar panel converts something into something else, then that solar panel uses that something to produce that something else & a solar panel converts sunlight / solar energy into electrical energy / electricity ->  a solar panel uses solar energy to produce electrical energy  a solar panel uses solar energy to produce electrical energy & solar energy is a renewable / inexhaustible resource ->  a solar panel uses a renewable resource to produce electrical energy  a solar panel uses a renewable resource to produce electrical energy & electrical energy is a kind of energy ->  a solar panel uses a renewable resource to produce energy  a home is a kind of building & energy is used for heating a building by a heating system ->  energy is used for heating a home  a solar panel uses a renewable resource to produce energy & energy is used for heating a home -> solar panels use a renewable resource to produce energy which is used for heating a home