An RC series circuit is connected to a 240-V, 60-Hz power source. An ammeter indicates a current of 20 amperes, and a wattmeter indicates that the circuit has a true power of 3 kW. What is the circuit power factor, and what is the capacitance of the capacitor?

An RC series circuit is connected to a 240-V, 60-Hz power source. An ammeter indicates a current of 20 amperes, and a wattmeter indicates that the circuit has a true power of 3 kW. What is the circuit power factor, and what is the capacitance of the capacitor?

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 7RQ: An RC series circuit is connected to a 120-V, 60-Hz power source. The resistor is 25 and 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

100%

An RC series circuit is connected to a 240-V, 60-Hz power source. An ammeter

indicates a current of 20 amperes, and a wattmeter indicates that the circuit has a

true power of 3 kW. What is the circuit power factor, and what is the capacitance

of the capacitor?

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