Household appliances

Submitted By:Amarnath Rajbhar

CASE STUDY

Contents Tube lightFanMotorRefrigerator

TUBELIGHTA fluorescent lamp or a fluorescent tube is a low

pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow.

CHARACTERISICS OF CFL Standard screw base that can be installed into nearly any

table lampCome in a variety of sizes and shapes.Have a much longer life—6,000 to 20,000 hours (10 to 20

times longer) compared to 750 to 1000 hours for a standard incandescent.

Can replace incandescent bulbs that are roughly 3 to 4 times their wattage, but can cost up to 10 times more than comparable incandescent bulbs.

Best energy-efficiency investments available. Although they cost more, they are very economical in the long run.

FANFans and blowers are used to move air from one area

to another, to provide or to remove cold, hot, dry or damp air. Applications are many and varied but the prime purpose is to move a mass of air.

Fans can be categorized into four main types defined by the method of air movement they employ.

1. Axial Fans2. Centrifugal (Radial) Fans3. Mixed Flow Fans4. Cross Flow Fans

Fans range in size from 36 inches to 56 inches using 55 to 100 watts, a typical 48 inch ceiling fan will use 75 watts.

MOTOR An electric motor is an electrical machine

that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator

How does an electric motor work? A simple electric motor can be built using a coil of

wire that is free to rotate between two opposite magnetic poles. When an electric current flows through the coil, the coil experiences a force and moves.

Use Of MotorIn various purpose motors are used like Fans, blowers, pumps, household appliance etc.

Refrigerator An refrigerator is machine which is artificially kept cool and used to store food and drink. Refrigerator is generally used for cooling effect.

How it is work? In the refrigeration cycle, there are five basic components like fluid refrigerant, a

compressor which controls the flow of refrigerant, the condenser coil.

1. The compressor constricts the refrigerant vapor, raising its pressure, and pushes it into the coils on the outside of the refrigerator.

2. When the hot gas in the coils meets the cooler air temperature of the kitchen, it becomes a liquid.

3. Now in liquid form at high pressure, the refrigerant cools down as it flows into the coils inside the freezer and the fridge.

4. The refrigerant absorbs the heat inside the fridge, cooling down the air.

5. Last, the refrigerant evaporates to a gas, then flows back to the compressor, where the cycle starts all over.

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