Choose the correct answer from the alternatives given: **Experiment No. 6: Comparator Circuit 6- .Adjusting the variable resistor or potentiometer the voltage reference is also change A) Yes B) NO 7- The voltage reference is zero, the output voltage of the comparator A) has positive dc voltage B) has negative dc voltage C) has the same width of the positive and negative cycles 8- If the voltage reference is equal to voltage input, how you will sketch it on the graph? A) draw a zigzag line B) draw a vertical line equal to the voltage reference C) draw diagonal on the graph D) draw a horizontal line

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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.