An incandescent light bulb is a device that converts electrical energy to light. It converts about 10 percent of the electrical energy it consumes into light; the remaining 90 percent is converted to heat. Consider a 10-cm-diameter 100-W light bulb cooled by a fan that blows air at 30°C over the bulb at a velocity of 2 m/s. The surrounding surfaces are also at 30°C, and the emissivity of the glass is 0.9. Determine the equilibrium temperature of the glass bulb [°C]. Assume that 10 percent of the energy passes through the glass bulb as light with negligible absorption and the rest of the energy is absorbed and dissipated by the bulb itself. Air 30°C 2 m/s 8 = 0.9 100 W Light, 10 W

An incandescent light bulb is a device that converts electrical energy to light. It converts about 10 percent of the electrical energy it consumes into light; the remaining 90 percent is converted to heat. Consider a 10-cm-diameter 100-W light bulb cooled by a fan that blows air at 30°C over the bulb at a velocity of 2 m/s. The surrounding surfaces are also at 30°C, and the emissivity of the glass is 0.9. Determine the equilibrium temperature of the glass bulb [°C]. Assume that 10 percent of the energy passes through the glass bulb as light with negligible absorption and the rest of the energy is absorbed and dissipated by the bulb itself. Air 30°C 2 m/s 8 = 0.9 100 W Light, 10 W

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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