Question

(a) The filament of a 75 W light bulb of my pressing iron may be considered as a black body radiating into a black enclosure at 700 C. The filament has a diameter of 0.10 mm and a length of 5 cm. considering the radiation, determine the filament temperature.

(b) As an electrical /electronic engineer of a company, how will you design an electrical transmission line 1500 m long that will carry a current of 50 A with no more than 5 * 105 W loss in power. The electrical conductivity of several materials is included.

Answer 1