Simple circuit, find equivalent resistance seen by the source

Click For Summary
SUMMARY

The discussion focuses on calculating the equivalent resistance seen by a voltage source in a circuit. The equivalent resistance (Req) is determined using the formula Req = R1R2 / (R1 + R2) and involves combining resistances in series and parallel configurations. The final equivalent resistance calculated is 10.82Ω, and the power delivered by the source is 18.11 W. The participants confirm the correctness of these calculations and clarify the interpretation of "seen by the source."

PREREQUISITES
  • Understanding of series and parallel resistor combinations
  • Familiarity with Ohm's Law
  • Knowledge of power calculations in electrical circuits
  • Basic circuit analysis techniques
NEXT STEPS
  • Study advanced circuit analysis techniques using Thevenin's and Norton's theorems
  • Learn about power factor and its impact on AC circuits
  • Explore the use of simulation tools like LTspice for circuit analysis
  • Investigate the effects of load variations on equivalent resistance
USEFUL FOR

Electrical engineering students, circuit designers, and anyone involved in analyzing or designing electrical circuits will benefit from this discussion.

qpham26
Messages
53
Reaction score
0

Homework Statement


For the circuit shown in Figure, find the
equivalent resistance seen by the source. How much
power is delivered by the source?

http://sphotos-b.xx.fbcdn.net/hphotos-snc7/304377_496325960386924_988412599_n.jpg

Homework Equations


Req = R1R2 / R1+ R2

P = V^2 / R

Thanks you for your time.

The Attempt at a Solution


I am not understanding what they meant by "seem by the source"
so I assume that they want to find R equivalent for the whole thing.

Start from the right to left
2Ω + 1Ω = Req1 = 3Ω
Req1 || 3Ω = Req2 = 1.5Ω
4Ω + 1.5Ω+5Ω || 6Ω = Req3 = 3.82Ω
---->ReqS = 3.82Ω + 7Ω = 10.82Ω
---->Ps = Vs2/ ReqS = 18.11 W
 
Last edited by a moderator:
Physics news on Phys.org
am not understanding what they meant by "seem by the source"
so I assume that they want to find R equivalent for the whole thing
.

Yes that is correct.

Imagine you were physically standing on the symbol for the 14V source voltage. What equivalent resistance do you "see" if looking to the right.

Your answers for the resistance and power are correct.
 

Similar threads

Engineering How do I find the Thevenin Equivalent of this circuit?
  • · Replies 10 ·
Replies
10
Views
3K
Engineering Norton/Thevenin Equivalent circuits with a dependent voltage source
  • · Replies 9 ·
Replies
9
Views
6K
Engineering Find the equivalent Resistance of the circuit
  • · Replies 14 ·
Replies
14
Views
6K
Engineering Circuit (equivalent resistance)
  • · Replies 5 ·
Replies
5
Views
2K
Engineering Find the Thevenin Equivalent circuit
  • · Replies 35 ·
2
Replies
35
Views
6K
Engineering Find the equivalent resistance of this circuit w/o Data?
  • · Replies 14 ·
Replies
14
Views
3K
Basic equivalent resistance problem
  • · Replies 1 ·
Replies
1
Views
2K
Engineering Finding Thevenin Equivalent Voltage for a Circuit with Multiple Voltage Sources
  • · Replies 12 ·
Replies
12
Views
3K
Engineering Finding the Thevenin Equivalent Circuit for a Network with a Load Resistor
  • · Replies 1 ·
Replies
1
Views
2K
Find the equivalent resistance seen by the source
  • · Replies 5 ·
Replies
5
Views
3K