The reliability and predictability of electronic circuits make possible highly accurate tools for measuring phenomena beyond the scope of human senses, such as the velocity of a bullet. This is demonstrated in the tutorial below.
In the circuit below (made up, in fact, of three distinct but overlapping circuits), a speeding bullet causes a capacitor to discharge during the very brief moment that it passes between two Tin-Foil Strips that are part of the circuit. By calculating (with the help of a galvanometer) the difference in the capacitor’s charge before and immediately after the bullet is fired, one can determine how much current the capacitor discharged in that moment. From this the bullet’s velocity can be derived. Here is a breakdown of how this works.