A capacitor is connected across a 120 V, 60 Hz supply. An ammeter indicates 5 A and a wattmeter indicates 10 W. Determine: the resistance of the capacitor. the power factor. the phase angle to the nearest tenth of a degree. the angle of phase defect to the nearest tenth of a degree

A capacitor is connected across a 120 V, 60 Hz supply. An ammeter indicates 5 A and a wattmeter indicates 10 W. Determine: the resistance of the capacitor. the power factor. the phase angle to the nearest tenth of a degree. the angle of phase defect to the nearest tenth of a degree

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter26: Three-phase Circuits

Section: Chapter Questions

Problem 3PA: You are an electrician working in an industrial plant. A 30-hp three-phase induction motor has a...

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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 connected across a 120 V, 60 Hz supply. An ammeter indicates 5 A and a wattmeter indicates 10 W. Determine:

the resistance of the capacitor.
the power factor.
the phase angle to the nearest tenth of a degree.
the angle of phase defect to the nearest tenth of a degree

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Step 1: Given that

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Step 2: 1. Calculation of resistance of the capacitor

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Step 3: 2. Calculation of power factor

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Step 4: 3. Calculation of phase angle

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Step 5: 4. Angle of phase defect

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