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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
IntermediateMCQMathematicalProportional Analysis25.1k
A single-loop schematic circuit. On the left branch is an ideal DC voltage source labeled \varepsilon with its positive terminal at the top, in series with a resistor labeled r. A dashed rectangular box encloses both \varepsilon and r, labeled 'Solar Panel'. On the right branch, connected across the terminals of the dashed box, is a single variable resistor labeled R. Connecting wires form a simple closed rectangular loop. No other labels, lines, text, or axes appear.
Circuit diagram modeling the solar panel and external load.
A real solar panel is modeled as an ideal voltage source of electromotive force \(\varepsilon\) in series with an internal resistance \(r\), connected across a variable load resistor \(R\). When \(R = r\), the electrical power delivered to the load resistor is \(P_0\). If the load resistance is increased to \(R = 3r\), what is the power delivered to the load resistor in terms of \(P_0\)?

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