Am I figurin' right?
Likes:  0

# Thread: Am I figurin' right?

1. Stainless
Join Date
Dec 2009
Location
Dearborn, Michigan
Posts
1,347
Post Thanks / Like
Likes (Given)
102
246

## Am I figurin' right?

I picked up a small Huppert heat treat furnace. It draws 15 amps at 110 volts.

If I run it for one hour it will draw 1650 Watts (15 x 110). My electric bill rate is 9 cents a kilowatt hour. That leaves me with .09 x 1.650 which equals .1485 or about 15 cents an hour.

It seems like a furnace that can get up to 1800 degrees or so would cost a lot more to run. Did I misplace the decimal? Is it \$1.50 an hour? I am pretty sure it is not \$15 an hour or more.

2. Join Date
Feb 2004
Location
Metuchen, NJ, USA
Posts
5,497
Post Thanks / Like
Likes (Given)
4437
920
Frank,

The line voltage is more like 120VAC these days. Or, are you actually measuring 110VAC under load?

You have the calculation correct for the voltage and current shown. It's a resistance load, so the Power Factor = 1.

You did forget to say "If I run it for one hour it will consume 1,650 Watt-hours or 1.65 KWh" (Watts are power; Watt-hours are energy.)

Yes, it really will cost about 15 cents/hour to run at you stated rate of 9 cents KWh

This is the magic of Reddy Kilowatts, your electric servant.

John Ruth

3. Titanium
Join Date
Jan 2014
Location
Temecula, Ca
Posts
3,276
Post Thanks / Like
Likes (Given)
1396
4272
Are you sure it only draws 1650 watts? I decent hair dryer draws more than that.

4. Stainless
Join Date
Dec 2009
Location
Dearborn, Michigan
Posts
1,347
Post Thanks / Like
Likes (Given)
102
246
Thanks for the replies.

The label says 110 volts so that is what I used for the calculation. But yes, I will have to add a little since it is no longer 110.

The labels also says 15 amps.

I guess the difference is the insulation.