Calculate Voltage: R1-R6, I4 = 4A

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SUMMARY

The discussion focuses on calculating the total voltage (U) in a circuit with resistors R1 through R6 and a current (I4) of 4A. The initial calculation yielded a total resistance (Rv) of 53.33Ω, leading to a voltage of 213.33V, which was identified as incorrect. The error was attributed to misunderstanding the current flow, specifically that I4 only represents the current through resistor R4. Participants emphasized the need to determine the overall current in the circuit to arrive at the correct voltage calculation.

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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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