# How much electricity does it take to run an oven at 450° for 12 minutes? ?

Update:

How much kW and how much does it cost

Relevance

It requires several assumptions.  However, an oven is usually protected by two 30 amp circuit breakers.  If you assume the oven is operating a 60% of the capacity of the breakers and 220 volts then they would use 0.6*220 volts* 60amps = 7,920 VA.  Assuming a .95 percent power factor, that would be 7920x.9 = 7,128 watts. Divide that by 1000 and you get 7.128 K watts for 12 minutes.    7.128 KW * 12 min/60 min per hour * \$.07/ KWH =  \$0.10

• That is not something that can be answered with the information you've provided.  Even if we knew the model of the oven, there are other factors involved.

A 220V electric oven draws 2000 to 5000 watts when on.  A small toaster 110V oven only 1200 to 1400 watts when on.

The "when on" is an important factor, since even though the device is turned on, once it reaches it's temperature, it turns off the element, and is not actually using energy.

When you first turn on the oven, it's cold and will draw the maximum amount of power until it reaches temperature, then it will cycle off and on to maintain that temperature.

This cycling will greatly change the amount of energy usage.  When you open the oven to place your item inside, you are letting in a lot of cold air at one time, which will cause the oven to draw energy to get it back to the set temperature.

The only way to truly answer this is to measure it, or know how many watts your appliance uses, and how long the element is on.

Assuming the oven is dead cold, and draws the maximum amount of power the entire time, and assuming you have a 3000 watt device, 12 minutes equals 0.2 hours, so 3 Kilowatts x 0.2 hours = 0.6 kW/hour.  0.6 kW/Hr x \$0.15/kW = \$0.09

• Depends on the oven, how efficient it is, how well insulated it is.  What is the oven?

• The temperature does not translate directly to energy use.

A heating element rated at 3000 watts, 4000 watts, or 5000 watts

can easily heat the inside of an oven to 450°.

The difference is in how much time it takes,

and power multiplied by time is what makes kilowatt-hours,

so you need to know how many watts the oven uses.

If it is one that has a bake/broil/roast selector,

finding out or figuring out how much energy is being consumed

gets pretty complicated pretty fast.

In addition, except when broiling or cleaning,

no heating element is on continuously.

Once the desired temperature is reached,

the thermostat will switch the element(s) on and off

to maintain the set temperature.

This Really makes it difficult to calculate energy use.