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.
Phantom Power is a term given to the process of delivering DC (Direct Current) to microphones requiring electric power to drive active circuitry. Condenser microphones such as Shureâs KSM range all have active circuitry and require phantom power.