Calculate Equivalent Resistance & Current Thru R1: Ohm's Law Problem

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Homework Help Overview

The problem involves calculating the equivalent resistance of a resistor network and determining the current flowing through a specific resistor, R1, when a voltage source is applied. The subject area is electrical circuits and Ohm's Law.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the calculation of equivalent resistance and question whether the current through R1 is equal to the equivalent resistance or if it should be calculated differently. There are inquiries about the necessity of knowing the voltage drop across another resistor, R4, and the significance of current direction.

Discussion Status

Some participants have provided hints regarding the relationship between voltage drops across resistors and the total voltage. Others are exploring their understanding of circuit breakdown and the implications of battery connection direction.

Contextual Notes

There is mention of confusion regarding the application of Ohm's Law and the setup of the circuit, indicating that participants are grappling with foundational concepts in circuit analysis.

mujadeo
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Homework Statement


Calculate the equivalent resistance of the network shown in the diagram. The resistances are: R1 = 12 ohm, R2 = 5 ohm, R3 = 15 ohm, and R4 = 15 ohm.

no prob here

Req = [(1/12)+(1/5)+(1/15)]^-1 + 15 = 17.86ohm

When a battery with E = 6 V and zero internal resistance is attached across this network, what current flows through resistor R1?



Homework Equations


Cant figure out if the current thru R1 is actually Req or R1.
When i use V=IR none of the answers come out correct.
Please help


The Attempt at a Solution

 

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To find the current through R1, find the voltage across it. Hint: First find the voltage drop across R4.
 
why do i need to know voltage drop across r4?
also does it matter which dorection the current is going?
 
mujadeo said:
why do i need to know voltage drop across r4?
Because the voltage across R1 + the voltage across R4 adds up to the total voltage.
also does it matter which dorection the current is going?
No, that just depends on which way the battery was connected.
 
ok i needed to relearn circuit breakdown and then build it back up.
thanks
 

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