The battery in Figure P31.95 has internal resistance (R_{text {batt }}=4.0 Omega) and maintains an (operatorname{emf} mathscr{E}=12.0

Question:

The battery in Figure P31.95 has internal resistance $R_{\text {batt }}=4.0 \Omega$ and maintains an $\operatorname{emf} \mathscr{E}=12.0 \mathrm{~V}$. What is the resistance $\mathrm{R}$ of the resistor connected in series with the battery if the current through the circuit is $0.5 \mathrm{~A}$ ?

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