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Hint: Voltage is the same in both cases There is a single loop circuit that has...

Image for There is a single loop circuit that has a resistance R. When you put an ammeter in the circuit it measures 8 AHint: Voltage is the same in both cases

There is a single loop circuit that has a resistance R. When you put an ammeter in the circuit it measures 8 A. Then if you add another resistor with a value of 4 Ohms in series to R, the current reading drops to 3.2 A. What is the original R value?
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