A cylindrical tungsten filament 11.0 cm long with a diameter of 1.35 mm is to be

Question

A cylindrical tungsten filament 11.0 cm long with a diameter of 1.35 mm is to be used in a machine for which the temperature will range from room temperature (20

A cylindrical tungsten filament 11.0 cm long with a diameter of 1.35 mm is to be used in a machine for which the temperature will range from room temperature (20 degree C) up to 120 degree C. It will carry a current of 15.0 A at all temperatures (consult tables [a] and [b] below). Resistivities at Room Temperature (20 degree) Temperature Coefficients of Resistivity (Approximate Values Near Room Temperature)

Explanation / Answer

R=?*L/A

=5.25*10-8*0.11/?(0.675*10-3)2

=4.0345m ohm

V=I*R

V=4.0345*15mV

=0.0605V

R=R0(1+??T)

=4.0345(1+0.0045(120-20))

=5.85m ohm

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