a resistor of R ohms is connected across a battery of E volts with internal resistance r ohms, then the power (in watts) in the external resistor is             P=E2R/(R+r)2 If E and r are fixed but R varies, what is the maximum value of the power

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Chapter23: Series And Parallel Circuits
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solve this problem and explain each step,  please

a resistor of R ohms is connected across a battery of E volts with internal resistance r ohms, then the power (in watts) in the external resistor is

            P=E2R/(R+r)2

If E and r are fixed but R varies, what is the maximum value of the power?

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