Elementary charge

The elementary charge, usually denoted by e or sometimes qe is the electric charge carried by a single proton or, equivalently, the magnitude of the negative electric charge carried by a single electron, which has charge −1 e. This elementary charge is a fundamental physical constant. To avoid confusion over its sign, e is sometimes called the elementary positive charge. Robert A. Millikan's oil drop experiment first measured the magnitude of the elementary charge in 1909.

Elementary charge

The elementary charge, usually denoted by e or sometimes qe is the electric charge carried by a single proton or, equivalently, the magnitude of the negative electric charge carried by a single electron, which has charge −1 e. This elementary charge is a fundamental physical constant. To avoid confusion over its sign, e is sometimes called the elementary positive charge. Robert A. Millikan's oil drop experiment first measured the magnitude of the elementary charge in 1909.