I am trying to figure out how many kilowatt-hours of electricity my little electric fan heater consumes when I have it running for an evening or so. On the back of it is a little tag that says "2000W" and "50Hz". If I run this thing for an hour, does that mean it consumes 2kWh (sounds a bit high to me)? I mean, if it runs full tilt for an hour, and its performance is 2000W max, isn't that 2 kilowatts per hour?
2006-07-14 22:45:19 · 4 answers · asked by Tahini Classic 7 in Science & Mathematics ➔ Physics
Yes, IF it runs its maximum power of 2 kW, then it uses 2 kW-hr in 1 hour.
But ... does the heater really run at maximum power all the time? If there's a thermostat setting on it, it's heater would switch on and off, and not always run at 2000 W.
2006-07-15 05:17:19 · answer #1 · answered by genericman1998 5 · 0⤊ 0⤋
2000 W is actually 2 kW. In one hour the fan consumes 2 kW, that is 2 kWh. So this means exactly 2 kilowatts per hour.
2006-07-14 22:58:14 · answer #2 · answered by ascaniosobrero 3 · 0⤊ 0⤋
two thousand watts .. for one hour ... results in
"2 kilowatt-hours" .. yes
do some study-up on the units involved
it's tough to make an "everyday" example to easliy but
here goes:
if you have a car which developes 100 horsepower when you put the gas-petal to the floor ... and you run your car this way for an hour .....
(side note: 100 horsepower makes your car "burn" 5 gallons of gas each hour you hold you foot to the flooor)
100 HP = 5 gal/hour
if you do this for 2 hours,
100 HP * 2 hour = 5 gal/hour * 2 hours
200 HP-hours = 10 gallons
watts is similar, unit-wise, to horsepower
you pay for gas by the gallon
you pay for electricity by the kilowatt-hour
2006-07-14 23:01:41 · answer #3 · answered by atheistforthebirthofjesus 6 · 0⤊ 0⤋
yup, that's the way it works. power consumption for a small heater with fan ranges from 1kw to 2.5kw
2006-07-14 22:55:04 · answer #4 · answered by oldguy 6 · 0⤊ 0⤋