1. A toroidal core having no air-gap has an average length of 60 cm. If the magnetic field intensity is 1,500 A-t/m, calculate the required current in the coil. а. 1.8 А b. 1.0 A С. 2.5 А d. 3.6 A

Q: Betz limit applies to O a. solar cells O b. heat engines O c. wind turbines O d. generator

A: Belz limit is the maximum efficiency of wind turbine.

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Q: Find the capacity of the generator.

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Q: Betz efficiency applies to O a. wind turbines O b. solar cells O c. parabolic dish O d. heat engines

A: The Betz limit is a theoretical maximum limit on the power production from a wind turbine.  Betz's…

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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.