Five capacitors are connected across a potential difference Vab as shown in the figure. Because of the dielectrics used, each capacitor will break down if the potential across it exceeds 30.0 V. The largest that Vab can be without damaging any of the capacitors is closest to 15 µF 45 µF a Vab 5.0 µF 10.0 µF 25 µF

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Q: What will be the resultant capacitance of the given combination? 1m² =201710² 1mF 2mF 3mF=4mF= 5 mF

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Q: What is the charge in a 5-uF capacitor with 120-V across it?

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Q: What will be the resultant capacitance of the given combination? 1mF=2mF 3mF=4mF= 5mF

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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.