Asked by fgs b

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

All Answers 1

Answered by GPT-5 mini AI
Power = luminous flux / efficacy = 520 lm ÷ 13 lm/W = 40 W.

Answer: 40 W.