What is the solution to calculating current and power in a circuit?

Click For Summary
SUMMARY

The discussion focuses on calculating current and power in a circuit, specifically determining the power delivered by a current source and the potential at various points in the circuit. The solution indicates that the power is 400 watts and the current is 1 milliampere. The methodology involves introducing unknown potentials at junctions of resistors, applying Kirchhoff's current law to establish equations, and solving for these unknowns to compute the necessary currents.

PREREQUISITES
  • Understanding of Kirchhoff's Current Law
  • Basic knowledge of circuit analysis techniques
  • Familiarity with Ohm's Law
  • Ability to solve simultaneous equations
NEXT STEPS
  • Study Kirchhoff's Voltage Law for comprehensive circuit analysis
  • Learn about Thevenin's and Norton's Theorems for simplifying circuits
  • Explore advanced circuit simulation tools like LTspice
  • Investigate power calculations in AC circuits using phasors
USEFUL FOR

Electrical engineering students, circuit designers, and anyone involved in circuit analysis and power calculations will benefit from this discussion.

-EquinoX-
Messages
561
Reaction score
1

Homework Statement




http://img69.imageshack.us/img69/3523/42317761.jpg
http://img194.imageshack.us/img194/7240/82479056.jpg

Homework Equations





The Attempt at a Solution



The answer is 400w and 1ma respectively, but how do I get to it?
 
Last edited by a moderator:
Physics news on Phys.org
How much power does a current source deliver to a circuit? On what depends it?
Can you figure out what the potential of the various parts of the circuit is?

For part b:

1. introduce two unknown potentials for the two points where 3 resistances meet. The
potentials at the top and bottom of the circuit are +40 mv and 0.

2. compute the currents in all five resistors as a function of the 2 unknown potentials

3. use Kirchhofs current rule in the points with unknown potential from step 1 to set up 2 equations for the unknown potentials

4. solve the equations

5. compute any current needed for the answer
 
for part a should I simplify the circuit? otherwise I am still lost on how to do it

and I am even more confused by your explanation in part b, which one are you referring when you say potential at top and bottom?
 

Similar threads

Replies
2
Views
2K
  • · Replies 8 ·
Replies
8
Views
22K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 18 ·
Replies
18
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 24 ·
Replies
24
Views
5K
Replies
4
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 10 ·
Replies
10
Views
2K