thermal instrument in which the indication is produced by the deformation of a bimetallic element, heated directly or indirectly due to Joule effect, soojuslik mõõteriist, milles näit tekib soojusliku toime tõttu otseselt või kaudselt kuumutatud bimetallilise elemendi deformatsiooni teel, thermal instrument in which the deformation of a bimetallic element (the materials having different rates of expansion due to a change temperature), heated directly or indirectly by a current, produces the indication