Task 3 An electronic instrument incorporates a 30V power supply. A digital display is added that requires a 5V power supply. Unfortunately the project is over budget and you are instructed to use existing power supply. Using a voltage divider, as shown in Figure 2, you should be able to obtain 5V as an input to digital display. Select values of R¡ and R2 so that the display will be supplied with 5Vvoltage under all condition of current. (a) (b) Calculate the maximum power dissipated by each resistor, R1 and R2. 30-volt power supply R1 Digital display 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.