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# how do i figure out how much electric something uses?

#1
11-23-05, 08:53 PM
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Join Date: Oct 2005
Posts: 411
how do i figure out how much electric something uses?

how do i figure out how much electric something uses?

I have a dehumidfier that I wantto find out how much it uses. Id like to compare this to my clothes dryer. What is the formula I can use for this?

#2
11-24-05, 06:47 AM
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Join Date: Dec 2001
Location: New York
Posts: 1,365
If both operate at 120V, then you can compare how many amps it uses. The should be information either on a nameplate in the equipment or on the instructions that came with them.
You are charged by the utility for volts x amps x power factor (don't worry about this for now) x the amount of time it is in use.

#3
11-24-05, 06:52 AM
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Join Date: Jun 2005
Location: Goodwood, Ontario
Posts: 140
I have an electric space heater with settings to run at 600 watts, 900, 1200 or 1500. Plate says 12.5 amps. To determine the cost of running it at max for one hour, can't I just multiply my utility's cost per kWh by 1.5?

#4
11-24-05, 07:04 AM
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Join Date: Sep 2003
Location: Central New York State
Posts: 13,973
I have an electric space heater with settings to run at 600 watts, 900, 1200 or 1500. Plate says 12.5 amps. To determine the cost of running it at max for one hour, can't I just multiply my utility's cost per kWh by 1.5?
Not exactly. Heaters do not run continually. They have a thermostat which cyles them off and on to maintain a desired temperature level.

Multiplying your electricity cost per KWH by 1.5 would be accurate if you ran the heater at the high setting for a full hour, without the unit cycling off and back on at any time.

#5
11-24-05, 10:46 AM
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Join Date: Jun 2002
Location: Northern Minnesota
Posts: 1,519
Sorry, must be having a brain cramp. Why multiply by 1.5?

My computer speakers use 200 watts and the power company's highest charge (anything over 350 Kwh) is .07218 cents. How much does it cost to be on for 8 hours?

Thanks,

Baldwin

#6
11-24-05, 11:03 AM
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Join Date: Nov 2004
Location: CA
Posts: 2,041
1. His heater uses 1500 watts at max setting. This is 1.5 kilowatts, so if run for an hour 1.5 times the KWH rate is the cost.

2. The 200 watts is just the speaker power, so there is really more than that. Howver, just considering the speaker: 200 times 8 hours is 1.6 KWH.
1.6 times \$.07 is about 12 cents. If the 200 is PER SPEAKER, then it would be 24 cents.

This is really not a good calculation, because the 200 watt rating is probably a max, and almost no kind of music delivers CONTINUOUS max power to the speaker.

#7
11-24-05, 11:25 AM
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Join Date: Jun 2002
Location: Northern Minnesota
Posts: 1,519
You are correct, the 200 W is speaker power rating, 5.1 speakers

The book says Power Requirements are:

115 V 60 Hz 400 watts.

So, with the power turned on to the speakers, even though not in use (playing music) they use 400 watts? That's worse than I thought.

Thanks

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