WELCOME

KERALA UNIVERSITY

COLLEGEOF TEACHER

EDUCATION,ANCHAL

Presented By

Name : Anusree V S

Optional : Physical Science

Reg No : 13975008

ELECTRIC SOURCE OF LIGHT

1.INCANDESCNET LAMP

2.DISCHARGE LAMP

3.FLUORESCENT LAMP

4.COMPACT FLUORESCENT LAMP

5.LIGHT EMITTING DIODE ( LED )

INCANDESCENT LAMP

PARTS

1.A THIN TUNGSTEN FILAMENT

2.GLASS BULB

3.METAL PART WHICH CONNECTS THE HOLDER PIN

1. INCANDESCENT MEANS GLOWING ON BEING HEATED.

2. TUNGSTEN IS THE MATERIAL USED FOR MAKING FILAMENT OF AN INCANDESCNET LAMP.

PROPERTIES OF TUNGSTEN

1. HIGH MELTING POINT.2. HIGH DUCTILITY.3. ABILITY TO REMAIN WHITE HOT FOR LONG TIME.4. HIGH RESISTIVITY.5. HIGH RESISTANCE.

DISCHARGE LAMP

PARTS1. A GLASS TUBE FILLED WITH SUITABLE GAS AT LOW

PRESSURE

2. ELECTRODES AT BOTH ENDS.

SL NO GAS IN THE DISCHARGE TUBE

COLOUR OF LIGHT

1 NEON ORANGE, RED

2 NITROGEN RED

3 SODIUM VAPOUR WHITE

4 CHLORINE GREEN

5 MERCURY VAPOUR WHITE

6 HYDROGEN BLUE

FLUORESCENT LAMP

LAMP

PARTS

1.HEATING COIL COATED WITH THORIUM OXIDE

2.GAS OF ARGON AND MERCURY VAPOUR.

3.FLUORESCENT SUBSTANCE.

4.GLASS TUBE

ADVANTAGES OF FLUORESCENT LAMP OVER INCANDESCENT LAMP

1. SAVES ELECTRICAL ENERGY TO A GREAT EXTENT.

2. THE INCONVENIENCE CAUSED BY SHADOW IS MINIMISED.

3. GIVES GREATER INTENSTIY OF LIGHT.

4. ENERGY LOSS IS LESS.

5. LIFE SPAN OF FLUORESCENT LAMP IS 5 TIMES THAT OF INCANDESCENT LAMP.

COMPACT FLUORESCENT

LAMP

1. A CFL HAS AN UNIT OF ELECTRONIC CIRCUIT AND A FLUORESCENT TUBE CONTAINING MERCURY VAPOUR.

MERITS OF CFL1. A VERY LOW POWER IS ENOUGH.2. LIFE OF CFL IS 5 TIMES THAT OF THE INCANDESCENT LAMP 3. GIVES MORE LIGHT 4. MAJORITY OF ENERGY USED IS CONVERTED INTO LIGHT ENERGY

LED

LIGHT EMITTING DIODE (LED)

HIGH ENERGY EFFICIENT LAMP

THANK YOU