1. Agbara ti o to: lilo awọn ohun elo aise ti ile ati ajeji, agbara ti o to, kekere resistance ti inu, ati foliteji iduroṣinṣin
2. Iduroṣinṣin iṣẹ: igbesi aye gigun gigun, iwuwo agbara giga, iwọn otutu ti n ṣiṣẹ jakejado, foliteji idasilẹ iduroṣinṣin