==نقل الطاقة==وأعرب عن السلطة تنتقل بين حزام وبكرة لبوصفها نتاجا لاختلاف سرعة التوتر وحزام:Power transmitted between a belt and a pulley is expressed as the product of difference of tension and belt velocity:where, T1 and T2 are tensions in the tight side and slack side of the belt respectively.
Power transmitted between a belt and a pulley is expressed as the product of difference of tension and belt velocity::formula_1where, T1 and T2 are tensions in the tight side and slack side of the belt respectively.