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.
Soft power is the ability to influence and shape others' choices and preferences without the use of traditional hard power tools (i.e. coercion and bribery). Nebulous and somewhat ambiguous, think of soft power as a country's brand, made up as a collection of the country's overall ideology, culture, and policy.