Scientists developed a tool to measure current called a galvanometer. A galvanometer uses the principles of electricity and magnetism, and circuit theory to detect and measure current in a conductor (something that conducts electricity).

How does a galvanometer detect current?

A galvanometer works by deflecting a pointer in response to an electric current flowing through a coil in a constant magnetic field. ... They were the first instruments used to detect and measure small amounts of current.

Does galvanometer detect electric current?

A galvanometer is an instrument that can detect and measure small amounts of current in an electrical circuit. The first galvanometer was built just months after Hans Christian Ørsted demonstrated in 1820 that an electric current can deflect a magnetized needle.