(4) Shown below is a circuit. Indicated in the circuit diagram are the directions of currents. You must use the indicated directions of currents when solving the problem. Use the numbers Vi = 3.63V, 72 = 4.54V, R1 = 858KN, R2 (a) What are the currents, I1, I2, and I3? (b) How much power is provided by the battery, V2? (c) The circuit is attached to the ground such that point D is now grounded. Do your currents from part (a) increase, decrease, or stay the same? Note: Your answer doesn't have to be the same for all the currents. 634kN, R3 = 225kN, and R4 = 417kN. %3D (d) While the circuit is grounded as described in part (c), what is the value of the potential at point A? А R1 В R2, |12 I3 R3 V1 V2 D R4 C

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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.