DRILL EXERCISE 1.8 Combine resistances in parallel and series in order to determine the resistance between terminals a and b for the connection of resistors given in Fig. DE18. Answer: 4.8 8+2+2=12 452 3+ЧН=8 452 3.5 1252 ΙΩ Fig. DE1.8 852 L www 252 2.522 352 ΣΕΩ Now consider the circuit given in Fig. 1.43(a). To determine how the voltage other words, a L EXAMPLE 1.7 Let us find the voltage v₂ nection of the 1-2 and 3-C resulting pair of 4-2 resis By voltage division, we h 2(28) 56 2+5 Returning to the original 3v₁ 3(8) 4 3+1 U₁ = V₂ = = DRILL EXERCISE

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A: By using KCL

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Q: voltage

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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.