A small bulb delivers an electrical power of 7.5 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity of alpha = 4.5 x 10 ^ (- 3 / ° C) When the filament is hot bright, its temperature is seven times the ambient temperature of a room (20 ° C). What is the resistance of the filament (in ohms) at room temperature? a. 5630 b. 4530 c. 1911 d. 1280
A small bulb delivers an electrical power of 7.5 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity of alpha = 4.5 x 10 ^ (- 3 / ° C) When the filament is hot bright, its temperature is seven times the ambient temperature of a room (20 ° C). What is the resistance of the filament (in ohms) at room temperature? a. 5630 b. 4530 c. 1911 d. 1280
Chapter9: Current And Resistance
Section: Chapter Questions
Problem 91CP: A student uses a 100.00-W, 115.00-V radiant heater to heat the student’s dorm room, dining the hours...
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A small bulb delivers an electrical power of 7.5 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity of alpha = 4.5 x 10 ^ (- 3 / ° C) When the filament is hot bright, its temperature is seven times the ambient temperature of a room (20 ° C). What is the resistance of the filament (in ohms) at room temperature?
a.
5630
b.
4530
c.
1911
d.
1280
e.
1350
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