- #1
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Homework Help Overview
The discussion revolves around finding the current in a circuit, specifically focusing on the relationship between resistance, total voltage, and the configuration of resistors in series and parallel. The participants are exploring concepts related to circuit analysis.
Discussion Character
- Exploratory, Conceptual clarification, Problem interpretation
Approaches and Questions Raised
- Participants are attempting to determine the current values based on given resistances and total voltage. Questions are raised about identifying series and parallel configurations within the circuit. There is also a discussion about using voltage and current divider principles.
Discussion Status
Some participants have shared their calculations and are seeking validation of their results. Others are asking for clarification on fundamental concepts and methods for analyzing circuits. There is an indication of helpful guidance being offered regarding circuit simplification and the use of online tools for verification.
Contextual Notes
There is mention of an attachment with answers, but the specifics of the circuit configuration and values are not provided in the discussion. Participants express confusion about the application of series and parallel rules in mixed circuits.
- #2
max1020
- 45
- 0
is I1 and I3 .22A too because 0.22+0.22+0.22=0.65
- #3
- #4
cpscdave
- 402
- 120
max1020 said:
Well the answer here is you have both :) R1 and R2 are in SERIES with one another and they are then in PARALLEL with R3.
Have you learned how to do voltage dividers and current dividers?
A method to solve simple problems like this is to simplify first then solve.
1) take the series resistors and make them into one (eg R4 = R1+R2)
2) take the parallel resistors and make them into one (eg 1/R5 = 1/R4 + 1/R3)
now you are left with a voltage source and a resistor. You can figure out I from I=V/R
Next you have to do the fun part.
Use a current divider equation to figure out the current through R4 and R3
Then use a Voltage divider to figure out the voltage drop across R1 and R2.
One thing I found extremely helpful which I'm all hesitant to post is this link http://www.falstad.com/circuit/
its an online circuit simulator. I strongly suggest you use only to verify your answers and if you find your answer is wrong you can verify your steps (eg build the original circuit and the circuit after step 2 and check the currents and voltages still line up). I know people who used this tool to solve all their assignments and ended up failing the course cause they couldn't do the work on the exam.