A 200 V lamp takes a current of 1 A, it produces a total flux of 2,860 lumens :

A 200 V lamp takes a current of 1 A, it produces a total flux of 2,860 lumens. The efficiency of the lamp is
(a) 9.9 lumens/W
(b) 8.9 lumens/W
(c) 10.9 lumens/W
(d) 14.3 lumens/W

Anurag Mishra Professor Asked on 1st February 2016 in Physics.
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    Answer: (d) 14.3 lumens/W 

    Anurag Mishra Professor Answered on 21st May 2016.
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