Question: A filament of a 230V lamp is to be drawn from a wire of having a diameter of 0.025mm and resistivity at 28°C is 5.65×10-6-cm. If the resistance temperature coefficient at 280°C is 5×10-3/°C. Calculate the lenght of the filament to dissipate 40W at filament temperature of at 3003°C.
Bloom's taxonomy level: Application