| A | B |
|---|
| renewable energy source | a resource that comes from a natural ongoing process that will continue into the foreseeable future |
| thermal collector | use sunlight to warm water, which is used to heat buildings |
| photovoltaic (solar) cell | cells found on calculators and satellites - they convert sunlight directly to electricity |
| semiconductor | any substance through which an electric current can pass with some effort |
| photons | light particles |
| electric current | a flow of electrons |
| concentrating solar power plant | huge mirrors that harness the sun's energy by reflecting on a small area |
| solar sails | used by spacecraft to convert sunlight's force into motion |
