Mathematics is defined as:
In physics, it refers to elementary charge, that is, elementary charge.
Elementary charge is also called "basic electricity" or "elementary charge". Among all kinds of charged particles, the amount of electron charge is the smallest. People call the minimum charge the elementary charge, which is also one of the basic constants in physics. It is often expressed by the symbol E. The elementary charge E =1.602176565 (35) ×10-/9 coulombs, (usually E =1. Is the amount of charge carried by an electron or a proton. The charge carried by any charged body is an integer multiple of or equal to E (except quarks, which are the only known elementary charge non-integer particles).