This type of coma is usually reversible once the blood sugar is corrected. Oxygen deprivation: Oxygen is essential for brain function. Cardiac arrest causes a sudden cutoff of blood flow and oxygen to the brain, called hypoxia or anoxia.
The external power supply is the AC power adapter that converts household AC electricity voltages to the much lower DC voltages needed to charge a mobile phone's internal battery.
With two equal resistances in series, half the voltage is dropped across each. There is a 6V internal drop in the power circuit, and 6V across the external load. If you calculate on that basis, the power in the external load is 12W by any method. Yes that is true.