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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
AdvancedMCQGraphicalMathematicalConceptual18.1k
A quantitative graph showing power P in watts on the vertical axis versus resistance R in ohms on the horizontal axis. The vertical axis ranges from 0 to 10 W with grid lines and tick marks every 1 W. The horizontal axis ranges from 0 to 16 ohms with grid lines and tick marks every 2 ohms. A smooth curve starts at the origin (0,0), rises continuously to a single maximum peak at (4, 9), and then smoothly decreases as R increases, passing through grid intersections at (2, 8), (8, 8), (12, 6.75), and (16, 5.76). No other text, labels, or construction lines appear.
Power dissipated versus load resistance
A circuit consists of a real battery with electromotive force \(\varepsilon\) and internal resistance \(r\) connected across a variable resistor of resistance \(R\). The graph shows the electric power \(P\) dissipated by the variable resistor as a function of \(R\). Based on the graph, what is the electromotive force \(\varepsilon\) of the battery?

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