A PMMC Ammeter has a coil of effective depth of 5 cm and a width of 20 mm, the coil has about 150 turns, and it has coil resistance of 20 ohms. The flux spread in the air gap is done at density of 100mWb / m Then calculate, 1. Control torque produced by the coil, when it measures 15 A. ii. Spring constant, when it measures 15 A and deflects by an angle of 30 ° Deflection torque exerted on the pointer, when it measures 20 A.

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Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.