An incandescent bulb produces 520 lumens and has an efficacy of 13 lm/W. What is the power of the bulb? 2.5 W 40 W 503 W 533 W

asked Feb 8, 2019 79.9k views

2 votes

An incandescent bulb produces 520 lumens and has an efficacy of 13 lm/W.

What is the power of the bulb?

2.5 W
40 W
503 W
533 W

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1 vote

Answer:

Step-by-step explanation:

just took the test

Ryan Martin answered Feb 10, 2019

7.7k points

1 vote

(520 lm) divided by (13 lm/W)

= (520 lm) times (W/13lm)

= (520/13) (lm · W / lm)

= 40 W

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