A moving coil instrument gives a full scale deflection of 10mA when the potential difference a cross its terminal is 100mV. Calculate 1) The shunt resistance for a full scale deflection corresponding to 100A ii) The series resistance for full scale reading with 1000V ⅲ) Calculate power dissipation in each case

A moving coil instrument gives a full scale deflection of 10mA when the potential difference a cross its terminal is 100mV. Calculate 1) The shunt resistance for a full scale deflection corresponding to 100A ii) The series resistance for full scale reading with 1000V ⅲ) Calculate power dissipation in each case

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter29: Dc Generators

Section: Chapter Questions

Problem 1PA: You are working as an electrician in a large steel manufacturing plant, and you are in the process...

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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.

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