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AP Physics 2
11.6 Kirchhoff’s Loop Rule
11.5 Compound Direct Current (DC) Circuits
11.3 Resistance, Resistivity, and Ohm’s Law
IntermediateMCQMathematicalConceptual13.3k
A rectangular single-loop circuit schematic. On the left vertical branch, a battery is depicted inside a dashed rectangle; inside the dashed box are a DC voltage source symbol and a series resistor labeled r = 2.0 \Omega. A voltmeter labeled V_term is connected in parallel across the terminals of the dashed box. On the top horizontal branch is a resistor labeled R_1 = 4.0 \Omega with a voltmeter labeled V_1 connected in parallel across it. On the right vertical branch is an unknown resistor labeled R_X. No other labels, lines, text, or elements appear.
Circuit diagram showing the battery, resistors, and voltmeters.
A battery with internal resistance \(r = 2.0\text{ }\Omega\) is connected in a single closed loop to a resistor \(R_1 = 4.0\text{ }\Omega\) and an unknown resistor \(R_X\). A voltmeter connected across the terminals of the battery reads \(10.0\text{ V}\), while a second voltmeter connected across \(R_1\) reads \(4.0\text{ V}\). What is the resistance of resistor \(R_X\)?

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