An incandescent light bulb uses a cold filament of tungsten that is 580 mm. long with a diameter of 46 um and has a resistivity of 5.25 x 103 O-m at 20°C. If the initial resistance of tungsten is 100 at 20°C and a temperature coefficient of resistance of 0.0045 rC. What is the temperature of the filament?

An incandescent light bulb uses a cold filament of tungsten that is 580 mm. long with a diameter of 46 um and has a resistivity of 5.25 x 103 O-m at 20°C. If the initial resistance of tungsten is 100 at 20°C and a temperature coefficient of resistance of 0.0045 rC. What is the temperature of the filament?

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter12: Electronic Control Devices

Section: Chapter Questions

Problem 14RQ

See similar textbooks

Similar questions

A certain batch of copper wire was found to have a conductivity of 98% at 20°C. What is its resistivity in u0-cm?
8. Liquids with solid impurities a) Have higher dielectrie strength b) Of large size have higher dielectric strength c) Have lower dielectric strength as compared to pure liquids d) None of the above 9. Peak to peak ripple is defined as a) the difference between average de voltage and peak value b) the difference between maximum and minimum de voltage c) the difference between maximum ac and average dc voltages d) the difference between ac (rms) and average de voltages 10. In a Cockroft-Walton circuit, input voltage 100 kV load current 25 mA, supply frequency 100 Hz, each capacitor 10 nF. The optimum no. of stages for maximum output voltage is a) 1 b) 2 c) 10 d) 35
The voltage sensitivities of Barium Titanate and Quartz are respectively 12 X 10-3 Vm/N and 50 X 10-3 Vm/N. Their respective permittivities are 125 X 10-8 F/m and 40.6 X 10-12 F/m. What are their charge sensitivities?
1- What are the various factors which affect Dielectric Strength?
this is the ability of a material to conduct electricity a. impedane b. conductance c. reactance d. capacitance
10) A certain batch of copper wire was found to have a conductivity of 98% at 20°C. What is its resistivity in uQ-cm?
It is the voltage supply that limits the AC voltage level. a. Square wave input b. Bias c. Output voltage d. Capacitor voltage
make an introduction of at least 30 lines about PROTOTYPE OF PIEZOELECTRIC BALLAST FOR GENERATING ELECTRIC ENERGY THROUGH THE PEDESTRIAN TRAFFIC
A barium titanate crystal has a thickness of 2 mm. Its voltage sensitivity is 12*10-3 Vm/N. It is subjected to a pressure of 0.5 MN/m2. What is the voltage generated ?
Dielectric breakdown means that the material is. Semi conductor Insulator Conductor None of these
A Piezoelectric type
It has a low level of conductivity under pressure from an applied voltage source conductor inductor insulator semiconductor