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AP Physics 2
11.5 Compound Direct Current (DC) Circuits
11.4 Electric Power
11.3 Resistance, Resistivity, and Ohm’s Law
AdvancedMCQGraphicalProportional AnalysisConceptual19.2k
A simple schematic circuit diagram. On the left side, a battery is enclosed by a rectangular dashed box containing an ideal emf source labeled \(\mathcal{E}\) in series with a small resistor labeled \(r\). Two wires extend from the dashed box to the right, connecting in series to a variable resistor represented by a zig-zag resistor symbol with a diagonal arrow drawn through it, labeled \(R_L\). No other labels, lines, text, or axes appear.
Circuit schematic with internal resistance and variable load.
A battery with electromotive force \(\mathcal{E}\) and non-zero internal resistance \(r\) is connected in series with a variable load resistor of resistance \(R_L\). As the resistance \(R_L\) is varied from zero to values much greater than \(r\), the electric power \(P_L\) dissipated by the load resistor changes. Which of the following graphs best represents \(P_L\) as a function of \(R_L\)?

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