A typical 12-V automobile battery, storing about 5 megajoules (MJ) of energy, is connected to a 4-A headlight system.
(a) Find the power delivered to the headlight system.
(b) Calculate the energy consumed in 1 hour of operation.
(c) Express the auto-battery capacity in ampere-hours (Ah) and compute how long the headlight system can be operated before the battery is completely discharged.