Rathnathilaka, K.A.C.; Jayatilleke, K.P.S.
(Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2018-02-15)
Incandescent lamps are still the most common source of electric lighting in most households. The bulb consists of a tungsten filament placed inside a glass bulb filled by an inert gas. Electric current flows through the ...