Saturday, December 15, 2007

1. Short circuit (sometimes abbreviated to short or s/c) allows a charge to flow along a different path from the one intended.short circuit occurs when the current finds a vary to by pass the appliance on a path that has little or no resistance.In electrical devices, unintentional short circuits are usually caused when a wire's insulation breaks down, or when another conducting material is introduced, allowing charge to flow along a different path than the one intended.

2.Fuse is a type of overcurrent protection device. Its essential component is a metal wire or strip that melts when too much current flows.When the fuse element blows, the indicating pin extends to activate the micro switch or relay which in turn triggers an event.


3.CIRCUIT BREAKER- is an absolutely essential device in the modern world, and one of the most important safety mechanisms in your home. Whenever electrical wiring in a building has too much current flowing through it, these simple machines cut the power until somebody can fix the problem. Without circuit breakers (or the alternative, fuses), household electricity would be impractical because of the potential for fires and other mayhem resulting from simple wiring problems and equipment failures.


3.An electrical overload is a situation where the wiring to or within a machine or system is subjected to a greater electric current load than it was designed to carry, leading to excessive heating of the wires and a possibility of fire. This excessive current load can be a result of electrical insulation failure (a short circuit) or human error.In an electrical overload, it leads to excessive heating of the wires and a possibility of fire.


6.In an electrical overload, it leads to excessive heating of the wires and a possibility of fire.In a short circuit, an accidental low-resistance connection between two nodes of an electrical circuit that are meant to be at different voltages. This results in an excessive electric current limited only by the Thevenin equivalent resistance of the rest of the network and potentially causes circuit damage, overheating, fire or explosion. Although usually the result of a fault, there are cases where short circuits are caused intentionally, for example, for the purpose of voltage-sensing crowbar circuit protectors.


7.The dangers of short circuit are it can cause fires which can damage things and will even caused lives. It can cause so much trouble to the family and community. It will destroy appliances in the house and will ruin properties because of the fire it caused.We should really try our best to avoid short circuit and overload by maintainig our appliances at constant state and provide it a better care so that in the end we will not suffer the consequences of it.