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Electric Bulb and Its Working

A fluorescent...

Question

A fluorescent light is 15% efficient. How many joules of light energy are produced from every 100j of electrical energy?Give reason .

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Solution

$D e a r S t u d e n t, G i v e n, E f f i c i e c y, η = 15 % = \frac{15}{100} E f f e c t i v e a m o u n t o f l i g h t e n e r g y p r o d u c e d f r o m 100 J o f e l e c t r i c a l e n r g y i s, E = 100 \times \frac{15}{100} = 15 J R e g a r d s . .$

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