I used the equation found here: http://www.brynmawr.edu/geology/206/operating%20cost%20formula.htm and one of my GRU bills to get the cost per kWh of $.04.
Appliances (unfortunately not all companies include the amount of amps and I attempted to calculate it myself) -
Razer Power Supply
9w
100-240v
11a
Cost: $0.87
Laptop Power Supply
65w
100-240v
1.7a
Cost: $0.61
Coffee Maker
650w
120v
.2a
Cost: $0.62
Toaster
780w
120v
.2a
Cost: $0.75
Camera Charger
24w
120v
.2a
Cost: $0.12
If I did the math right I can plug a few appliances in at once without issue but I probably shouldn't exceed using more wattage than the combination of the coffee maker and toaster.
For the circuit board I took apart an old computer keyboard:
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