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4 March, 07:27

A resistor with R1=25.0 ohm is connected to a battery that has internal resistance and electrical energy is dissipated by R1 at rate of 36.0 W. If a second resistor with R2 = 15.0 ohm is connected in series with R1, what is total rate at which electrical energy is dissipated by the two resistors

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  1. 4 March, 07:32
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    Use the power and R1 to find the voltage of the battery

    P = V²/R

    V = √ (PR) = √ (36.0 W) (25.0 ohm) = 30 V

    Now find the equivalent resistance of the new configuration

    R_equivalent = R1 + R2 = 40 ohm

    Now find the power (energy rate)

    P = V²R = (30 V) ² / (40 ohm) = 22.5 W
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