The diagram represents an electric circuit consisting of a 12-volt battery,a 3.0-ohm resistor, R1 and a variable resistor, R2 at what value must the variable resistor be set to produce a current of 1.7 A through R1? Round your answer to one decimal place

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A: Equivalent resistance in series R = R1 + R2  Equivalent resistance in parallel 1/R = 1/R1 + 1/R2

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