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Electricity and Magnetism

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Voltage and Current Changes in Circuits

EANDM-D58MTZ

Consider the circuit in the accompanying diagram. The battery, with a voltage, $V$, is connected to three resistors as shown, and is delivering a current $I$.

If the $5\Omega$ resistor were to be replaced with a $15\Omega$ resistor, by what factor must the voltage on the battery, $V$, be changed in order that the current leaving the battery remain unchanged at its original value, $I$.

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