What type of meter movement is typically used in wattmeters?

The type of meter movement typically used in wattmeters is electrodynamic movement. This choice is correct because electrodynamic movements are designed to measure both the current and voltage in an electrical circuit, which is essential for calculating power in watts. In a wattmeter, two coils are generally involved: one connected to the current and the other connected to the voltage, which allows for accurate measurement of real power in AC circuits.

Electrodynamic movements are advantageous in wattmeters due to their ability to handle high frequencies and varying loads, resulting in stable and reliable readings. The interaction between the magnetic fields produced by the currents in the coils provides a direct measure of the power consumed.

Other types of movements, such as thermistor, induction, and moving-coil, may have specific applications in measuring different electrical parameters, but they do not provide the same level of effectiveness for wattage measurement as electrodynamic movements do. For example, moving-coil movements are generally used in voltmeters and ammeters due to their sensitivity, but they are not suitable for the range of conditions and complexities associated with wattage measurement.