Part A

When switch $\backslash ($ S $\backslash )$ in $($Figure $1)$ is open, the voltmeter V of the battery reads $3\mathrm{.}13$ V $.$ When the switch is closed, the voltmeter reading drops to $2\mathrm{.}90$ V $,$ and the ammeter A reads $1\mathrm{.}61$ A $.$ Assume that the two meters are ideal, so they don't affect the circuit.

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Figure

Find the emf.

Express your answer in volts.

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$\backslash$mathcal$\{$E$\}=$

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Part B

Find the internal resistance of the battery.

Express your answer in ohms.

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Part C

Find the circuit resistance $\backslash ($ R $\backslash ).$

Express your answer in ohms.

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R$=\backslash$square $\backslash$Omega

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