Determining values of resistance, voltage, and current throught a circuit

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Homework Help Overview

The discussion revolves around a circuit analysis problem involving the determination of total resistance, total current, and individual values for resistors and voltages. Participants are exploring the application of Kirchhoff's loop rule and Ohm's law in the context of a circuit with a battery and multiple resistors.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants are attempting to understand the implications of current and voltage markings in the circuit. Questions are raised about the interpretation of the battery's polarity and the meaning of current values at different points in the circuit. There is also discussion about using Ohm's law to find resistance values based on voltage and current.

Discussion Status

Some participants have provided clarifications regarding the battery's polarity and current flow. There is an ongoing exploration of how to apply the relevant equations to find unknown values, though no consensus has been reached on the specific steps to take. One participant indicated they found a solution independently.

Contextual Notes

Participants are working under the constraints of a homework assignment, which may limit the information they can share or the methods they can use. There is uncertainty regarding the circuit's configuration and the values of the components involved.

doublea500
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Homework Statement



Question asks for a lot of stuff...
Total Resistance
Total Current
R1, V1 <
V2, I2 <----- R=resistance V=Voltage I= Current 1 is resistor 1, 2 is res2...
R3, I3 <

Homework Equations



V=IR
Kirchoffs loop rule

The Attempt at a Solution



Well I am completely lost because i don't know a few things.
well to start it off, I am going to have to use the loop rule. here's my few questions before i actually start it. Where it says the 1.5A after R1, does that show that the amplitude for R1 is 1.5 or the amplitude for the parallel circuit after it is 1.5A. for the V on the top, how do i know which is positive and which is negative (doesnt have long and short lines). and with the 9v battery, it has 2 sets of small lines and big lines. does this mean anything or is it just left is - and right is +?
 

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Firstly, with the battery the smaller line (on the left) is negative, the other is positive. You should be able to work out which side of the V is negative and which is positive from that. The A is just showing that there is 1.5amps flowing through the circuit at that point. That's the best i can do for now so if anyone else has more detail, please add.
 
Hints on solving circuit problems in the steady state (i.e., \frac{\partial \Phi_B}{\partial t} = 0):

  1. Mark the different currents
  2. Identify the potential differences across batteries, resistors, and capacitors (for the latter, assign arbitrary charges)
  3. Identify the loops you will evaluate
  4. Use ΔV =0 to find equations for potential difference
  5. If needed, use Kirchhoff's junction rule to find the relationship between currents
  6. Solve the system of equations
 
frog210293 said:
Firstly, with the battery the smaller line (on the left) is negative, the other is positive. You should be able to work out which side of the V is negative and which is positive from that. The A is just showing that there is 1.5amps flowing through the circuit at that point. That's the best i can do for now so if anyone else has more detail, please add.

like what I am trying to ask is if you do V=IR would it be 9V=1.5A*R1 and then you could find r1 like that?
 
nevermind, i found it out. thanks for the help
 

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