Electron

principle · 1897 · Electric age

An elementary negatively charged particle (Thomson).

Author: Joseph John Thomson.

Where it is used

• Electrical conduction — is used in. Current in metals is a flow of electrons.
• Quantum mechanics — is used in. How electrons behave in atoms.
• Electron microscope — is used in. A beam of electrons instead of light.
• Photoelectric effect — is used in. Electrons are knocked out.
• Hall sensor — is used in. The magnetic field deflects the electrons.

History: what it evolved from and what it influenced

• Atomic theory — evolved from. The atom turned out to be divisible.
• Cathode-ray tube — evolved from. Thomson discovered the electron in cathode rays.

Open Evothings