Part A An acb sequence balanced three-phase Y-connected source supplies power to a balanced three-phase A-connected load with an impedance of 18+ j12 /. The source voltage in the b-phase is 250/-55°V. The line impedance is 1+ j1 /. Use the single-phase equivalent circuit for the a-phase to find the current in the a-phase of the load. Express your answer in amperes to three significant figures. Enter your answer using angle notation. Express argument in degrees. IAB ΜΕ ΑΣΦ 11 vec ? A Submit Request Answer < Return to Assignment Provide Feedback

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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.