The variable resistor (R.) in the circuit in Fig. P4.88 is adjusted until it absorbs maximum power from the circuit. a) Find the value of Ro. b) Find the maximum power. c) Find the percentage of the total power devel- oped in the circuit that is delivered to Ro. Figure P4.88 60 V +1 202 ww + VA - + 4Ω www 5Ω is 4 is me ne.no W nio od m 2 VA Ro

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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.