Two resistors of 6Ω and 3Ω are first connected in parallel. The combination is then connected in series with a 5Ω resistor across a 12V battery of negligible internal resistance.
(a) Calculate the equivalent resistance of the entire circuit.
(b) Determine the power supplied by the battery.
(c) If the circuit is kept on for 2min, find the electrical energy consumed in joules.