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AP® Physics C: E & M

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Internal Resistance of the Battery: Current of $135\ \text{mA}$

APPHEM-K69HYY

A $3\ \text{V}$ battery is connected in series to a ${20}\ \Omega$ resistor.

What is the approximate internal resistance of the battery of the current passing through the resistor is $135\ \text{mA}$?

A

$0.045\ \Omega$

B

$0.45\ \Omega$

C

$4.5\ \Omega$

D

$0.2\ \Omega$

E

$2\ \Omega$