see if we can estimate the temperature of the filament at the “standard\" voltag

Question

see if we can estimate the temperature of the filament at the “standard" voltage of 12 volts. Part K The filament of the light bulb is made of tungsten. The resistance of the light bulb at room temperature (20° C), measured by an ohm-meter, is about 3.0 . Based on this information, estimate the temperature of the light bulb at 12.0 V. Neglect the thermal expansion of the filament Express your answer in degrees Celsius using three significant figures. View Available Hint(s) Submit Previous Answers Incorrect, Try Again; 3 attempts remaining

Explanation / Answer

In the problem it is given to estimate temperature at 12 V, but it is Corrected as 12 Ohms

Resistance Variation with temperature is given by

R = Ro [1 + alpha*(T2 - T1)]

Temperature coefficent of tungsten, alpha = 0.0045 /oC

Hence,

12 = 3 [1+0.0045*(T - 20)]

3/0.0045 = T - 20

T = 686.667 oC

temperature of the bulb at 12 Ohms is 686.667 oC

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