How can i measure electricity use on a device by device basis.?
For example, if i have a choice of cooking something in a toaster oven or a microwave, which one is more economical? How much does a complete cycle of my dishwasher cost? How much electricity is used in this lamp vs. that lamp?
You need a WATT-HOUR meter. It does the same thing for one device as the one on the side of your house does for your whole house. Watt-hour meters can be the big bulky electromechanical thing on the side of your house all the way down to a tiny electronic box which plugs into the wall and you plug the appliance into the box and read the numbers off the display. If you go the electromechanical route, you need need a SINGLE PHASE meter rated at 110-120 volts AC. It will have 4 terminals. 2 are incoming and 2 are outgoing. You literally slice an extension cord and one side goes in series in one wire and the other side in series with the other wire. If you get the hot wire on the wrong side, the meter will turn backwards. Simply swap sides and it will turn the right way. Disassemble the dials and reset them to zero. Build the works into a nice box. Use a super heavy duty cord and keep it as short as you can on each side of the meter. I have two of these. I also have a solid state electronic device which cost 5x as much as the meter and extension cord and a homemade wooden box. The brand name is Kill-A-Watt. You can likely find one at any big box hardware store. I have a small space heater in my garage for freeze protection when my electronic one is currently living. I put my electromechanicals on my deep freeze and refrigerator. Of the three, over the past 3 months, the fridge leads 2 to 1 over the others at amount of electricity used. Compared to the electric heating in my house and the water heater and stove, these 3 that I am tracking are a drop in the bucket. One last thing, for something like an electric stove, you need a different kind of meter as they are usually 2 or 3 phase and rated at 220 volts, which is exactly like the one on the side of your house. And then, you will need an electrician to wire it for you as working with more than 1 phase is too complicated to address here.
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