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How long does it take a lightbulb to use 1kj of energy?
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How long does it take a lightbulb to use 1kj of energy?

User Oliver Giesen
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1 Answer

2 votes

Answer:

13.3 seconds

Step-by-step explanation:

The complete question is...

How long does it take a 75 W lightbulb to use 1 kJ of energy?

The Energy of the bulb E = 1 KJ = 1000 J

The power rating of the lightbulb = 75 W

The power rating of a bulb P = Energy used per unit time = E/t

substituting, we have

75 = 1000/t

t = 1000/75 = 13.3 seconds

User Grmartin
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