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How many kilowatts does a philips 90 watt floodlight use in a 12 hour period?
Wiki User
∙ 8y ago
You need to understand the difference between power - as in watts - and energy - as in Watt hours.
Watts/kiloWatts only tells you what it's doing at the moment, at that very instant. While Wh/kWh tell you the sum of what it's been doing over a certain time.
1 kW = 1000 w
So 90 W / 1000 W = 0.09 kW
As soon at the light is turned on, the lamp starts to use energy at the rate of 90 W = 0.09 kW
If you leave it on for 12 hours it will have used up 0.09 x 12 = 1.08 kWh
Wiki User
∙ 8y ago
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