ಕೆಳಗಿನವುಗಳಲ್ಲಿ ಯಾವುದು ಶಕ್ತಿ ಪರಿವರ್ತಕ ಅಲ್ಲ?

A solar panel converts light to electricity, a steam engine converts heat to motion and an electric iron converts electricity to heat. Plain glass only lets light through; it does not convert energy.