Application of heating effect of current.
Application of heating effect of current.
1. Electric heater and water heater When these appliances are in connection with the supply of electricity they become hot but wires remain cold. They consist nichrome which has high resistivity and hence high resistance. Heat produced is directly proportional to the resistance of material through which the current flows.
2.Electric Bulb
The filament of an electric bulb consists of tungsten with a high melting point. A filament is enclosed in a glass envelope which is filled with nitrogen and argon gas. Since the resistance of thin filament is very high, amount of heat production is large same as the electric current that flows through the filament. Due to a large amount of heat production, the filament bulb becomes white hot. Hence filament of bulb emits light and heat.
3.Electric fuse Wires consisting of some materials melt quickly and break when large electric current passes through them. These wires are used for making electric fuses. All electrical circuits in all buildings consist of electrical fuses. There is a maximum limit on the current which can safely flow through a circuit. If by accident the current exceeds this limit, the wires may overheat and cause a fire. If a proper fuse is there in the circuit, it will blow off and break the circuit.
4.Electric iron The element of the electric iron constitutes alloys having a high melting point. Electric heater and geyser work on the same mechanism.
When these appliances are in connection with the supply of electricity they become hot but wires remain cold. They consist nichrome which has high resistivity and hence high resistance. Heat produced is directly proportional to the resistance of material through which the current flows.
2.Electric Bulb
The filament of an electric bulb consists of tungsten with a high melting point. A filament is enclosed in a glass envelope which is filled with nitrogen and argon gas. Since the resistance of thin filament is very high, amount of heat production is large same as the electric current that flows through the filament. Due to a large amount of heat production, the filament bulb becomes white hot. Hence filament of bulb emits light and heat.
3.Electric fuseWires consisting of some materials melt quickly and break when large electric current passes through them. These wires are used for making electric fuses. All electrical circuits in all buildings consist of electrical fuses. There is a maximum limit on the current which can safely flow through a circuit. If by accident the current exceeds this limit, the wires may overheat and cause a fire. If a proper fuse is there in the circuit, it will blow off and break the circuit.
4.Electric ironThe element of the electric iron constitutes alloys having a high melting point. Electric heater and geyser work on the same mechanism.
