Here are some simple examples:
I have a 100 watt light bulb on my front porch that is turned on approximately 5 hours every evening. I am paying about $1.59 a month on my electric bill.
100w X 5 hrs = 500w divided by 1000 = .5 kWh every evening. Multiply by 30 days/month.
.5 kWh X 30 days = 15 kWh a month.
15 kWh X 10.6 cents (.106) = $1.59 a month on my bill. (About 5 cents every evening).
I have a 12 cup coffee maker that is on approximately 2 hours every morning. The label on the bottom of the coffee maker reads 7.5 amps, 120 volts. To find the watts you multiply amps X volts, 7.5a X 120v = 900 watts. I am paying about $5.72 a month on my electric bill.
900w X 2 hrs = 1800w divided by 1000 = 1.8 kWh every morning. Multiply by 30 days/month.
1.8 kWh X 30 days = 54 kWh a month.
54 kWh X 10.6 cents (.106) = $ 5.72 a month on my bill. (About 19 cents every morning).
We have a 3.5 quart slow cooker (crock pot) that we will use on average about 8 hours, 7 times a month to prepare dinner. The label on the bottom reads 120 volts, 190 watts. The amount of watts is already given, no need to figure it out. I am paying about $ 1.13 a month on my electric bill or .16 each meal we prepare. Certainly an economical way to prepare dinner.
190w X 8 hrs = 1520w divided by 1000 = 1.52 kWh each meal. Multiply by 7 meals/month.
1.52 kWh X 7 meals = 10.64 kWh a month.
10.64 kWh X 10.6 cents (.106) = $ 1.13 a month on my bill. (About 16 cents a meal).