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AP Physics 2
11.5 Compound Direct Current (DC) Circuits
11.3 Resistance, Resistivity, and Ohm’s Law
IntermediateMCQGraphicalProportional Analysis18.8k
A schematic circuit diagram of a single closed loop. On the left vertical branch, a DC voltage source is drawn with a long parallel line and a short thick line, labeled \(\Delta V_0\). On the top horizontal branch, a zig-zag resistor symbol is drawn and labeled \(R_0\). On the right vertical branch, a second zig-zag resistor symbol is drawn with a diagonal arrow pointing through its center, labeled \(R_x\). Solid black lines connect all components in a continuous rectangular loop. No other components, text, or labels appear.
Circuit schematic with variable resistor
A circuit consists of an ideal DC voltage source of potential difference \(\Delta V_0\), a fixed resistor of resistance \(R_0\), and a variable resistor of resistance \(R_x\) connected in series. The resistance \(R_x\) is initially set to zero and is then gradually increased. Which of the following graphs best represents the current \(I\) in the circuit as a function of the variable resistance \(R_x\)?

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