To believe is to accept something as true, with the inference that it is not empirically or even anecdotally provable.
Accepting the theory of electricity requires no belief because it can be tested for and observed. It can be accepted as factual with empirical evidence of its existence.
Evolution can be tested for, and observed, albeit not as obviously to the average person. This also with empirical evidence of its reality.
So, neither requires belief.
Precisely why no one would ever ask the question concerning electricity, right?
Why refer to such lines of questioning such as "for those that believe in evolution" then?