Hey Soul, it's difficult to quantify this exactly, but let's try. Individual burners on electric stove tops use between 1200 and 2600 watts, depending on their size. You might notice on most stove tops the burners are different size, this is to accomodate different sized pots and pans. A small burner, 1200 watts let's say, will only use that much power while it is running, which means on high. Once you turn the knob down even a little, the thermostat inside the burner begins modulating the burner on and off to keep it at a selected temperature. If you run a burner all the way down to its lowest setting, it is probably only coming on about 2-3 minutes per hour, in little 5 and 10 second blasts, just enough to keep it warm. In a nutshell, running a 1200 watt burner 3 minutes per hour, or 1/20 of the time, is the same as running a 60 watt light bulb continuously. A 60 watt light bulb on for 6 hours will use 60 X 6 = 360 watt hours, or .36 kilowatthours (kwh). Your electric bill is calculated by how many KWH's you use, and you would have to consult yours to see, but a common average is about 15 cents (USD) per KWH. So my best guess is that burner on low for 6 hours probably costs less than 2 cents.
This seems cheap, and in reality it is. The reason people have big electric bills is not usually their rates, it's their usage. Appliances that are basically on all the time, refrigerators, freezers, water heaters and such, are your big users. Do you know anyone with an old fridge in their garage that they keep a couple cold ice teas in? An old fridge is horribly inefficient to begin with, then when you put it in the hottest room in the house, well, you get the picture. That fridge easily eats $20 to $30 per month, expensive ice tea.
There is a neat device called the "kill-a-watt meter" that you can buy online for around $30. It looks like a lamp timer, plugs into the wall, and you can plug any device you want into it. It will not only tell you current wattage, but also tell you how many KWH's a device uses if you leave it plugged in for maybe a week. You can figure out how many dollars and cents something costs you to run very accurately with one of these. Check it out sometime, and take care, Rudydoo