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## Homework Statement

In the circuit of figure p28.23, determine the current in each resistor and the potential difference across the 200 ohms resistor.

http://s848.photobucket.com/albums/ab41/tag16/?action=view¤t=circuit.jpg&newest=1

## Homework Equations

1/Req= 1/R1+1/R2+1/R3+1/R4

I=deltaV/R

deltaV= IR

## The Attempt at a Solution

Req=1/(1/200ohms +1/80ohms+ 1/20ohms+ 1/70ohms)= 12.22 ohms

I=-240V/12.22ohms= -19.6 A

deltaV= (-19.6A)(12.22)= -239 V

Am I doing this completely wrong? If so what do I need to do?