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.
Like USB and FireWire, Thunderbolt can provide power to connected peripheral devices. That means external devices that require 10 watts of power or less can be powered directly from the Thunderbolt port. Additionally, simple adapters can be used to connect USB, FireWire, and Ethernet devices to a Thunderbolt port.