Questions about circuits and Resistors

Click For Summary
SUMMARY

This discussion focuses on solving circuit problems involving resistors, specifically how to calculate equivalent resistance for various configurations. The key equations utilized are Ohm's Law (V=IR) and the power formula (P=V^2/R). The participant successfully explains that resistors in series are summed directly (Rtotal = R1 + R2 + R3...) while resistors in parallel require the reciprocal formula (1/Rtotal = 1/R1 + 1/R2 + 1/R3...). A practical approach is suggested, including redrawing circuits for clarity.

PREREQUISITES
  • Understanding of Ohm's Law (V=IR)
  • Knowledge of series and parallel resistor configurations
  • Familiarity with circuit diagram interpretation
  • Basic algebra skills for solving equations
NEXT STEPS
  • Study the principles of series and parallel circuits in more depth
  • Learn how to use circuit simulation software like LTspice
  • Explore advanced topics such as Thevenin's and Norton's theorems
  • Practice solving complex circuit problems from resources like "Fundamentals of Electric Circuits" by Alexander and Sadiku
USEFUL FOR

Students studying electrical engineering, physics students tackling circuit analysis, and educators looking for effective teaching strategies in circuit theory.

taculator
Messages
7
Reaction score
0

Homework Statement



http://www.sewanee.edu/physics/PHYSICS102/Ch28.pdf
On this link, can anybody explain to me how to set up problems 1-5?
The answers are on the page, but I have no idea how to group the resistors together to find their equivalent resistance...
Please I've been working on this for hours and i cannot figure it out

Homework Equations



V=IR
P=V^2/R

The Attempt at a Solution

 
Last edited by a moderator:
Physics news on Phys.org
resistors in series will be Rtotal = R1+R2+R3...
resistors in parallel will be 1/Rtotal = 1/R1 + 1/R2 + 1/R3...
Now look at question one for example, the resistor(2R) diagonally placed is in fact parallel to the 2 resistors with value of R bottom right and bottom, in turn these two resistors are in series.

and finally the net resistance of this series and parallel combination is in series with the resistor (R) which is at the top.
Now you can figure out what the net resistance is and you are done =) if you get confused try "redrawing" the circuit in a way you can visualize the series and parallel combinations.
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 60 ·
3
Replies
60
Views
10K
  • · Replies 4 ·
Replies
4
Views
2K