capacitor is placed in parallel with two inductive loads one of 20 amp at 30° and one of 40 amp at 60° lag. What must be the current in the capacitor so t the current from the external circuit shall be at unity power factor

capacitor is placed in parallel with two inductive loads one of 20 amp at 30° and one of 40 amp at 60° lag. What must be the current in the capacitor so t the current from the external circuit shall be at unity power factor

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter21: Resistive-capacitive Series Circuits

Section: Chapter Questions

Problem 6RQ: A 15-F AC capacitor is connected in series with a 50 resistor. The capacitor has a voltage rating...

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Concept explainers

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.

Question

A capacitor is placed in parallel with two inductive loads one of 20 amp at 30°
lag and one of 40 amp at 60° lag. What must be the current in the capacitor so
that the current from the external circuit shall be at unity power factor
*F

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