The filament of anincandescent lightbulb is a thin tungsten wire. Suppose a ligh

Question

The filament of anincandescent lightbulb is a thin tungsten wire. Suppose a lightbulbhas a resistance of 42 at roomtemperature. During normal operation, the filament reaches atemperature of about 2990 K. (a) What is its resistance at that temperature?The temperature coefficient of resistivity for tungsten is = 4.5 x 10-3K1.
The filament of anincandescent lightbulb is a thin tungsten wire. Suppose a lightbulbhas a resistance of 42 at roomtemperature. During normal operation, the filament reaches atemperature of about 2990 K. The filament of anincandescent lightbulb is a thin tungsten wire. Suppose a lightbulbhas a resistance of 42 at roomtemperature. During normal operation, the filament reaches atemperature of about 2990 K. The filament of anincandescent lightbulb is a thin tungsten wire. Suppose a lightbulbhas a resistance of 42 at roomtemperature. During normal operation, the filament reaches atemperature of about 2990 K. The filament of anincandescent lightbulb is a thin tungsten wire. Suppose a lightbulbhas a resistance of 42 at roomtemperature. During normal operation, the filament reaches atemperature of about 2990 K. The filament of anincandescent lightbulb is a thin tungsten wire. Suppose a lightbulbhas a resistance of 42 at roomtemperature. During normal operation, the filament reaches atemperature of about 2990 K. The filament of anincandescent lightbulb is a thin tungsten wire. Suppose a lightbulbhas a resistance of 42 at roomtemperature. During normal operation, the filament reaches atemperature of about 2990 K. (a) What is its resistance at that temperature?The temperature coefficient of resistivity for tungsten is = 4.5 x 10-3K1.
(a) What is its resistance at that temperature?The temperature coefficient of resistivity for tungsten is = 4.5 x 10-3K1.
(a) What is its resistance at that temperature?The temperature coefficient of resistivity for tungsten is = 4.5 x 10-3K1.

Explanation / Answer

Rresistance R= 42 Room temperature t= 27 oC                               = 27 + 273 = 300 K Hot filamenttemperature t ' = 2990K. Rresistance R= 42 Room temperature t= 27 oC                               = 27 + 273 = 300 K Hot filamenttemperature t ' = 2990K. Rresistance R= 42 Room temperature t= 27 oC                               = 27 + 273 = 300 K Hot filamenttemperature t ' = 2990K. Rresistance R= 42 Room temperature t= 27 oC                               = 27 + 273 = 300 K Hot filamenttemperature t ' = 2990K. (a)The temperature coefficient of resistivityfor tungsten is = 4.5x 10-3 K1. we know = ( R ' - R ) / [ R ( t '- t ) ] from this temperature at 2990 K is R ' =R [ 1+ ( t ' - t ) ]                                                            = 550.41ohm            
(a)The temperature coefficient of resistivityfor tungsten is = 4.5x 10-3 K1. we know = ( R ' - R ) / [ R ( t '- t ) ] from this temperature at 2990 K is R ' =R [ 1+ ( t ' - t ) ]                                                            = 550.41ohm            
(a)The temperature coefficient of resistivityfor tungsten is = 4.5x 10-3 K1. we know = ( R ' - R ) / [ R ( t '- t ) ] from this temperature at 2990 K is R ' =R [ 1+ ( t ' - t ) ]                                                            = 550.41ohm            

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