!$ \large{P_{MEC} \times 0.736 \times \eta \over Fu \times cos \varphi} !$

!$ \large{P_{MEC} \times 0.736 \times Fu \over \eta \times cos \varphi} !$

!$ \large{P_{MEC} \times 0.736 \times V \over Fu \times I} !$

!$ \large{P_{MEC} \times 0.736 \times V \times I \over Fu \times \eta} !$