How Do You Calculate Power and Resistance in Electrical Circuits?

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SUMMARY

This discussion focuses on calculating power and resistance in electrical circuits, specifically addressing two problems involving an 8Ω resistor (Rx) and the determination of equivalent resistance (Req). The first problem requires calculating current (I), voltage (Vx), power absorbed by the voltage source, and power supplied by Rx, while noting the impact of a short circuit across a 4Ω resistor. Participants emphasize the importance of understanding resistor combinations and applying relevant formulas rather than simply providing answers.

PREREQUISITES
  • Understanding Ohm's Law and its application in electrical circuits
  • Knowledge of series and parallel resistor combinations
  • Familiarity with power calculations in electrical circuits
  • Basic circuit analysis techniques
NEXT STEPS
  • Study the principles of Ohm's Law for current and voltage calculations
  • Learn about series and parallel resistor combinations in detail
  • Explore power calculation methods for resistors and voltage sources
  • Review circuit analysis techniques, including Thevenin's and Norton's theorems
USEFUL FOR

Electrical engineering students, circuit designers, and anyone involved in analyzing and solving electrical circuit problems.

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I need help with these 2 problems:

1. If Rx = 8, compute (a) I (b)Vx (c) the power absorbed by the voltage source (d) the power supplied by Rx.
attachment.php?attachmentid=20982&stc=1&d=1254887861.jpg


2. Determine the value of Req
attachment.php?attachmentid=20983&stc=1&d=1254887861.jpg
 

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There are problems with the first question.

Resistors absorb power and voltage sources supply power. Not the other way around.

In the first diagram there is a short circuit across the 4 ohm resistor. This makes 5 components irrelevant.

Assume this short circuit is not intended and remove it.

After that, the exercise is just an example of solving the result of serial and parallel resistor combinations.

The rules of this Forum are that you need to show your own effort at solving these problems and that you have found the necessary formulas for working out resistor combinations.
It would actually be easier to just tell you the answers, but you wouldn't learn anything if that happened. So, it isn't going to happen. :)
 

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