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.
The sources of transients are classified as. i) Internal sources ii) E xternal sources. The internal sources are classified as. a) S witching surges i.e., due to the opening and closing of a switch in power system. b) Insulation failures. c) A rcing ground. d) F erro resonance. The external source for power system transient is lightning. 2. What is meant by resistance switching. A delibrate connection of a resistance in parallel with the contact space (a rc) i s made. to overcome the effect of transient recovery voltage. This is known as Resistance switching.