I have a doubt: we already know that the efficiency of a weapon is obtained through a formula that relates the DPS and the DPP (I do not know what the formula is, I can not relate them correctly) ...

And the fact of placing amplifiers / laser / etc? these additions also have efficiency, sometimes greater than the weapon where they are placed, but sometimes the overall performance is lower than that of the weapon ...

Two questions:

1) Does anyone have the real formula to calculate the efficiency of a weapon?

2) Does anyone know how to calculate the overall efficiency of the weapon / laser / amplifier / etc set? If there is a formula about it, what is it?