# explaining ohmic loss and understanding inverter efficiency curve

I'm trying to understand an efficiency curve from PVsyst, using this documentation

However, I'm not sure what this sentence means:

• This production is penalized by an ohmic loss$$^1$$ of the internal components (transformer and transistors), which increases quadratically$$^2$$ with power (like R · I²)$$^3$$. *
1. What is meant by ohmic loss in this instance?
2. When it mentions that it increases quadratically, does it mean in quadratic form (equation) i.e. $$ax^2 + bx + c = 0$$ and how does this relate to the efficiency curve of an inverter, relative to power loss?
3. What does the equation represent, and what does it suggest when either parameter $$R$$ or $$I^2$$ is greater than the other?

• The link did not address the page intended. Although, when clicking on the link documentation, then referring to "See also the construction of automatic efficiency profiles", when on that page, under the sub-heading Automatic-efficiency profiles it makes reference to the equation here: "in a quadratic way as function of the power (R * I²)" I'm not sure what R * $I^2$ represents. And thank you for the previous explanation, they're very helpful! – Lime Jan 28 at 16:50