A 100 W Electric Lamp Emits Energy in the Form of Light at the Rate 10 J per Second. What Percentage of Electric Energy Does the Lamp Transform into Light Energy? - Physics

Numerical

A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?

Solution

Given power of lamp = 100 watt

rate of dissipation of light = 10 J/s

Therefore, percentage of electrical energy converted into light energy = 10/100 xx 100% = 10%

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Frank ICSE Class 10 Physics Part 2
Chapter 1 Force, Work, Energy and Power
Exercise 1.5 | Q 26 | Page 54