When a nonideal battery is connected to a \(2.0-\Omega\) resistor in a circuit, the current in the circuit is \(2.0 \mathrm{~A}\). When the same battery is connected to a \(1.0-\Omega\) resistor in a circuit, the current in the circuit is \(3.0 \mathrm{~A}\). What are \((a)\) the internal resistance of the battery and \((b)\) its emf?