Calculate Voltage: R1-R6, I4 = 4A

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The discussion focuses on calculating the total voltage (U) in a circuit with resistors R1 through R6 and a current of I4 = 4A. Initial calculations led to a total resistance (Rv) of 53.33Ω, resulting in a voltage of 213.33V, which was identified as incorrect. It was clarified that I4 represents the current through R4 only, and the overall current needs to be determined for accurate voltage calculation. Participants suggested finding the relationship between the overall current and I4 to resolve the issue. The conversation emphasizes the importance of correctly identifying current paths in circuit analysis.
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Homework Statement


R1=30Ω R2=20Ω R3=20Ω R4=10Ω R5=40Ω R6=10Ω I4=4A
I need to calculate U (total voltage)
schematic:
http://i43.tinypic.com/2jvbx2.png


Homework Equations





The Attempt at a Solution


R23=1/(1/10+1/20)=10ohm
R234=10+10=20ohm
R2345=1/(1/R234+1/R5)=1/(1/20+1/40)=13,33ohm
Rv=R1+R2345+R6=30+13.33+10=53,33ohm
U=I4*Rv=4*53.33=213,33V

213,33V is not correct...
 
Last edited:
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Welcome to PF!

Hi stefanomm! Welcome to PF! :smile:

(try using the X2 tag just above the Reply box :wink:)
stefanomm said:
U=I4*Rv=4*53.33=213,33V

No, I4 is the current through R4 only …

you need to find the "overall" current

(call it I, and find the relation between I and I4). :smile:
 
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