Give scientific reasons:
(1) The material used for fuse has low melting point.
(2) Wood and glass are good insulators.
(3) The melting point of filament of a bulb is very high.
(4) Connecting wires in a circuit are made of copper and aluminum.
Give scientific reasons:
(1) The material used for fuse has low melting point.
(2) Wood and glass are good insulators.
(3) The melting point of filament of a bulb is very high.
(4) Connecting wires in a circuit are made of copper and aluminum.
(1) The melting point of the material used for fuses is low because if the current exceeds the limiting value then the temperature of wire increases and the fuse wire melts and breaks down at that very moment. So, the current stops. This prevents damaging the costly electrical appliances connected through the circuit. Due to this reason, the material used for fuses has low melting point.
(2) In the case of wood and glass, free electrons are not present and that offers an infinitely high resistance (opposition) to the flow of current. They hardly allow any current to flow through them making them good insulators.
(3) When the filament of the bulb is heated to a high temperature through electricity, it emits light. The melting point of tungsten is about 3,3800C which is used to make the filament and it does not melt easily. Due to this reason, the melting point of the filament of a bulb is very high.
(4) Copper and aluminium are good conductors of electricity and they offer very low electrical resistance. This allows the electricity to flow through it easily. Also, copper and aluminium are much cheaper than gold and silver. Hence both these metals are used to make connecting wires.
(1) The melting point of the material used for fuses is low because if the current exceeds the limiting value then the temperature of wire increases and the fuse wire melts and breaks down at that very moment. So, the current stops. This prevents damaging the costly electrical appliances connected through the circuit. Due to this reason, the material used for fuses has low melting point.
(2) In the case of wood and glass, free electrons are not present and that offers an infinitely high resistance (opposition) to the flow of current. They hardly allow any current to flow through them making them good insulators.
(3) When the filament of the bulb is heated to a high temperature through electricity, it emits light. The melting point of tungsten is about 3,3800C which is used to make the filament and it does not melt easily. Due to this reason, the melting point of the filament of a bulb is very high.
(4) Copper and aluminium are good conductors of electricity and they offer very low electrical resistance. This allows the electricity to flow through it easily. Also, copper and aluminium are much cheaper than gold and silver. Hence both these metals are used to make connecting wires.
