ddy currents and the resulting electromagnetic torque are directly proportional to the instantaneous power in the circuit: The product of the magnetic flux from the voltage coil and the current in the current coil produces an interaction that produces a torque proportional
needle deflects proportionally to this torque, providing a direct reading of active power in watts. Calibration and Accuracy Considerations Proper calibration ensures the wattmeter's readings are accurate and reliable. The calibration process involves: Applying known power sources. Adjusti
nimal tolerance Step-by-Step Procedure for Calibrating Wattmeter by Phantom Loading Preparation Before starting, gather all necessary equipment: Wattmeter to be calibrated Standard reference wattmeter (if available) for comparison High-precision resistors
