The sinusoidal voltage source in the circuit seen in (Figure 1) is operating at a frequency of 44 krad/s. The coefficient of coupling is adjusted until the peak amplitude of 1 is maximum. Figure 20 Ω 100 Ω 5 mH k 75 Ω ww 320 mH 300 £2 1 of 1 40 nF What is the value of k? Express your answer using three significant figures. k = 0.56 IVE ΑΣΦ Part B Submit Previous Answers Request Answer X Incorrect; Try Again; 29 attempts remaining i₁ = ↓↑ μA vec What is the peak amplitude of ₁ if v = 309 cos(4.4 x 10¹t) V? Express your answer to three significant figures and include the appropriate units. Value Pearson Units ? ? Re

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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.