30 minutes is 0.5 hours.
1 kilowatt = 1000 watts, so divide both sides by 1000 and you get .001 kilowatts = 1 watt
So
8 watts x 30 minutes = .008 kilowatts x 0.5 hours = .004 kilowatt hours.
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To convert watts to kilowatt-hours, divide by 1000.
8 watts for 30 minutes is (8/1000) * 0.5 hours = 0.004 kilowatt-hours.
Well, honey, if you've got a 1500-watt appliance running for 10 minutes, that's gonna be 0.25 hours (10 minutes is 1/6 of an hour). So, you'd end up using 0.375 kilowatt hours (1500 watts * 0.25 hours = 375 watt hours = 0.375 kilowatt hours). Hope that clears things up for ya!
Well, isn't that a happy little question! To find out how many kilowatt-hours 50 watts used for 12 hours equals, we simply need to do a little math. Since 1 kilowatt is equal to 1000 watts, we can convert the 50 watts to 0.05 kilowatts. Multiplying 0.05 kilowatts by 12 hours gives us a total of 0.6 kilowatt-hours. Happy calculating!
To convert kilowatt-hours (kWh) to watts, you need to multiply by 1000. So, 1209 kWh is equal to 1209,000 watts.
1 kilowatt = 1000 watt ==> 1 watt = 0.001 kilowatt
Watts does not have a time component to it; so you should have asked, "How many kilowatt-hours does an oven use per hour?' For example, if the oven uses 1600 watts, then in one hour, it would use 1600 watt-hours, or 1.6 kilowatt-hours.