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

If 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 E'R +rf value of the power? P(R)= . If E and r are fixed and R varies, what is the maximum

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