4. A moving coil instrument has the following data, Number of turms 100, Width of coil – 20 mm, W- 20mm Depth of coil 30 mm, D- 30mm flux density in the air gap - 0.1 Wb m. Calculate the deflecting torque when the coil carry a current of 10 mA. Also calculate the deflection, if the control spring constant (K) is 2 x 104 Nm'degree.

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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.