This is not a dumb question. The relationship was derived by some of physics' best minds in the early 20th century and requires an understanding of other physic

This is not a dumb question. The relationship was derived by some of physics' best minds in the early 20th century and requires an understanding of other physical principles and calculus to explain. I can't think of a concise/non-technical explanation. This Feynman lecture is about as close as you'll get: http://www.feynmanlectures.caltech.edu/I_15.html http://www.feynmanlectures.caltech.edu/I_15.html