High school physics question 24: Make a rough estimate of the capacitance of an isolated human body. ( The Hint: It must be about the capacitance of a sphere with the same volume as a typical person. ) so By shuffling over a nylon rug on a dry winter day , you can easily charge yourself up to a couple of kilovolts . If you touch a metal sparks can fly. How much energy is there in such a spark ? This is the electrical energy that would be dissipated in the spark