How does a moving coil meter indicate measurement?

A moving coil meter indicates measurement by utilizing a needle that is moved by a magnetic field. This type of meter operates on the principle of electromagnetic induction, where a coil of wire is placed within a magnetic field. When an electric current passes through the coil, it generates a magnetic field that interacts with the magnetic field of a permanent magnet. This interaction creates a torque that causes the coil—and therefore the attached needle—to rotate. The angle of rotation is proportional to the amount of current flowing through the coil, allowing for an accurate analog representation of the measurement on a calibrated scale.

This method effectively converts electrical energy into mechanical movement, enabling users to read measurements directly on the scale. The mechanical movement provides a simple and reliable indication of current or voltage levels, making moving coil meters widely used in various applications for direct current (DC) measurements.