A variable resistor R, is connected across the terminals a b in the circuit in (Figure 1) The vanable resistor is adjusted until maximum power is transferred to R, Suppose that ,-280 V and R-3.6 kft Figure 1 of 1 2 kf w 0.2 is 2kf w 3240 SP Find the value of R Express your answer to three significant figures and include the appropriate u R₂ = Submit Part B PR. = μA Submit Value Find the maximum power delivered to R Express your answer to three significant figures and include the appropriate un Units My Answers Give Up μA Value → Units ? My Answers Give Up ? Part C Find the percentage of the total power developed in the circuit that is delivered to R Express your answer using three significant figures.

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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.