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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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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

User Frieder Hannenheim
by
7.6k points

2 Answers

1 vote

Answer:

40

Step-by-step explanation:

just took the test

User Ryan Martin
by
7.7k points
1 vote

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

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

= (520/13) (lm · W / lm)

= 40 W
User Reblochon Masque
by
8.3k points
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