Suppose we construct a voltage divider circuit as shown in Figure 1.1 where the voltage source V₁ is a 9Volt battery. Furthermore, we will implement resistor R₁ using two terminals of a 10k pot so that R₁ is variable over the range 0 ≤ R₁ ≤ 10kſ. Find the largest value of the resistor R₂ that will allow the output voltage to vary over a range that includes at least 1.5V ≤ V₂ ≤ 5. OV. Show how you arrived at this value. Then, choose a resistor (or combination of resistors) from your parts kit that will get you as close as possible to (but no larger than) your calculated value for R₂.

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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.