The given circuit below is supplied by a 24V dc source. A 5-ohm resistor is connected in series with the parallel combination of 25-ohm and unknown resistor R3. Find the value of the unknown resistor if the total power to the given circuit is 21.80 watts. R1=5N V = 24V R2=25N R3

The given circuit below is supplied by a 24V dc source. A 5-ohm resistor is connected in series with the parallel combination of 25-ohm and unknown resistor R3. Find the value of the unknown resistor if the total power to the given circuit is 21.80 watts. R1=5N V = 24V R2=25N R3

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter7: Parallel Circuits

Section: Chapter Questions

Problem 3PP: Using the rules for parallel circuits and Ohmslaw, solve for the missing values....

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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

The given circuit below is supplied by a 24V dc source. A 5-ohm resistor is connected
in series with the parallel combination of 25-ohm and unknown resistor R3.
Find the value of the unknown resistor if the total power to the given circuit is 21.80
watts.
R1=5N
V = 24V
R2=25N
R3

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