!!!!!**Electric Circuit with Open Switch**!!!!!--Help PLEASE

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kmcknight12

Joined Feb 27, 2011
1
It's problem number 4 of the attached PDA file...please help. I understand basic circuits: how to find current, voltage, resistance, etc., but I don't know how to do it with the open switch, and how it affects the overall problem and why. Thanks for your help!
 

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