Calculating Current Through a Resistor Using Short Circuit Method

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Homework Help Overview

The discussion revolves around calculating the current through a resistor (R1) using the short circuit method in a circuit involving both voltage and current sources.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants explore different methods for calculating the current, including short circuiting sources and applying Ohm's law. Questions arise regarding the correctness of initial calculations and assumptions about current distribution between resistors.

Discussion Status

Several participants have provided feedback on the original poster's calculations, with some suggesting alternative approaches and questioning the assumptions made. There is an indication of productive dialogue, with some participants expressing agreement on certain values.

Contextual Notes

Participants are working under the constraints of homework rules, which may limit the information shared and the methods discussed. There is a focus on ensuring the accuracy of current calculations based on resistor values and configurations.

dimpledur
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Homework Statement


Find the current through the resistor R1.
figure3.jpg




The Attempt at a Solution


First I short circuited the voltage source and determined I1.

I1=(9A)(10-olms/18-olms)=5 A down

Next, I short circuited the current source and determined the current going through R1 via olms law.

I2=18V/18-olm= 1 A up

Therefore, the total current flowing through the resistor R2 is 4 A down

Does this seem right?
 
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You made a mistake in finding I1 when you short circuited the voltage source. What i would do is to find the equivalent resistance of R1 and R2, then the voltage across them, and then I1.
Since R1 is bigger than R2 there should be more current through R2

The rest is OK.
 
There is more current going through R2 I thought.
 
I think I figured it out.

I1=(9A)(80)/(180) = 4 A down
 
Then that means that there is 3 amps down total. Does that seem more appropriate?
 
Anyone?
 
3 amps looks good.
 

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