A Small Bulb Is Rated at 7

Multiple Choice

A small bulb is rated at 7.50 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity α = 4.50 × 10−³ / °C. When the filament is hot and glowing, its temperature is seven times room temperature (20 °C) . What is the resistance of the filament (in ohms) at room temperature?

A) 234
B) 1 350
C) 2 080
D) 4 530
E) 5 630