A 12 V battery with internal resistance 1 Ω is connected in series with a 4 Ω resistor. A 2 Ω resistor is connected in parallel across the 4 Ω resistor.
a. (i) Determine the current through the 2 Ω resistor.
b. (ii) Calculate the energy converted into heat in this 2 Ω resistor in 5 minutes.