3. In figure 3 R1 = 1 ohm, R2 = 1 ohm, R3 = 3 ohms, I2 = 2A and VB = 120 V. Find Eg. In the DC circuit as shown in figure 4, the high resistance voltmeter gives a reading of +0.435 volt. What is the value of the resistance R?

Q: The equivalent resistance between points A and B:(shown in figure) is? C r www B wwww

A: Solution !!

Q: For the Cicuit shown 'in Figure Vcc sgV j Bc = 1-8 K^ ,=100 Zo=? Bc Ai = ?

A: Zo = 1.66kΩ  Zi = 733Ω  Re = 7.47Ω  Ai = 19.3

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Q: In the figure the current in resistance 6 is ig = 1.34 A and the resistances are R, = R, = R3 = 1.62…

A: Given data: i6=1.34 AR1=R2=R3=1.62 ΩR6=3.17 ΩR4=15.4 ΩR5=8.87 Ω The circuit is given as:

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A:

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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.