Which type of meter movement uses a coil suspended in a magnetic field?

The moving coil meter movement operates by utilizing a coil of wire that is situated within a magnetic field. When an electric current passes through the coil, it generates a magnetic field around the coil itself. This interaction between the coil's magnetic field and the external magnetic field results in a torque that causes the coil to rotate. The degree of this rotation directly corresponds to the current flowing through the coil, allowing for accurate measurements.

This type of mechanism is fundamental in analog measurement devices, especially in voltmeters and ammeters, where precise readings are necessary. The simplicity and sensitivity of moving coil instruments make them well-suited for measuring low levels of AC or DC current.

While other types of meter movements exist, they operate based on different principles. For instance, the moving iron meter uses a piece of iron that moves in response to magnetic forces, whereas thermal meters rely on the heat produced by current flow. Digital meters, on the other hand, convert analog signals into digital readouts, involving no mechanical movement. The moving coil method distinguishes itself through its inherent sensitivity and accuracy in measuring electrical parameters.