I’m reading Sucatcher catches thermal energy at 31.25 % efficiency. So, if it could do it at 100%, how much energy would that be? Measured how? By what? Does anything pick up 100% and use it or make it useful?

Best answer:

Answer by Prof. Normal
A solar cell’s efficiency is the percentage of incident light energy that is converted to electric energy. 31% is actually really good for a solar cell, most of them are under 20.
As for a theoretical 100% cell, the Second Law of Thermodynamics forbids any process from being perfectly efficient, but we’ll keep getting closer and closer…

Know better? Leave your own answer in the comments!