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A resistor is wired to a battery in a circuit and dissipates a power P1 as heat. A second resistor, with
the same resistance, is added in series with the first resistor, leading the circuit (i.e. both resistors) to
dissipate a power P2 as heat. How much does the circuit dissipate with two resistors, relative the
circuit with one resistor, or in other words, what is the ratio P2/P1?

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