The efficiency of a filament light bulb is 5%. A typical incandescent light bulb uses 60 W of electrical power. Calculate the power given off by the light bulb in: a) wasted thermal power b) useful light energy

The efficiency of a filament light bulb is 5%. A typical incandescent light bulb uses 60 W of electrical power. Calculate the power given off by the light bulb in: a) wasted thermal power b) useful light energy

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter9: Energy In Nonisolated Systems

Section9.9: Power

Problem 9.6CE

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The efficiency of a filament light bulb is 5%. A typical incandescent light bulb uses 60 W of electrical power. Calculate the power given off by the light bulb in:

a) wasted thermal power

b) useful light energy

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