Carl6, a 100 watt light bulb running 24 hrs every day would cost me about $9 per month or 10% of my total monthly bill ! 10% of my total electrical consumption for a multi-switch is higher than I would have ever thought. Thanks for your "number crunching"
I find your numbers for the cost of the light bulb hard to believe. My lowest bills of the year are in the fall and spring when it is not cold or hot enough to have those 2 items running much. My lowest bill is about $120 for that.
During that time I have the following running around the clock:
3 DirecTV receivers, the PI, 3 UPS units, 5 computers, a modem, a wireless router, 4
60 13 watt light bulbs in various parts of the house, one 120 watt halogen light bulb and of course a refrigerator. At night I have 2 sets of lights in addition to the listed that are both 120 watt set ups that run from dusk til dawn. During the day 2 of the TV set ups are running for approximately 16 hours of the day. Once a week the Washer and Dryer ( gas dryer with electric drum motor and fan). Every day the electric garage door opener is used about 4 times.
A DVR uses about 35 watts whether it is turned on or off.
You would probably find a "Kill A Watt" very useful. It can show the exact wattage / amps / volts, etc. and if you punch in the current rate you pay for electricity it can show how much an item is costing you to run it.
Edit / Add: I have been looking around on the web and found a calculator. It works really easy. Has several items above it that you can choose and it will plug in the usual wattage used by the item and you can just type in your own numbers.
From this calculator it appears that the cost is quite high like you posted for a 100 watt light bulb.
Link: http://www.electrici...aspx?Device=100 Watt Incandescent Light Bulb&Watts=100
Edited by jimmie57, 30 June 2014 - 08:02 AM.