- #1
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SUMMARY
This discussion focuses on calculating current in circuits with both series and parallel resistors. The user identifies resistors R1 and R2 as being in series, while R3 is in parallel with the combined resistance of R1 and R2. The method to solve such problems involves simplifying the circuit by combining series resistors into one equivalent resistor and then calculating the total resistance for parallel resistors. The user emphasizes the importance of using tools like the Falstad Circuit Simulator for verification, while cautioning against relying solely on simulators for exam preparation.
PREREQUISITES- Understanding of Ohm's Law (I = V/R)
- Knowledge of series and parallel resistor configurations
- Familiarity with voltage and current divider rules
- Basic skills in using circuit simulation tools
- Learn how to apply Ohm's Law in complex circuits
- Study series and parallel resistor combinations in detail
- Explore voltage divider and current divider equations
- Practice using the Falstad Circuit Simulator for circuit analysis
Electrical engineering students, hobbyists learning circuit analysis, and anyone looking to improve their understanding of current flow in mixed resistor 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.