Physics-current electricity, circuit

lydigihome
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Homework Statement



[PLAIN]http://img208.imageshack.us/img208/4577/physicso.jpg

Homework Equations





The Attempt at a Solution



dont know how to do..
help please, how can i find that is 4V?
 
Last edited by a moderator:
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oh, some small amendment:
that 15ohm at the top righthand corner should be 10ohm
 
lydigihome said:
oh, some small amendment:
that 15ohm at the top righthand corner should be 10ohm

But the resistor in the top right-hand corner is 20 ohms...
 
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