For example, a 7-amp refrigerator uses 840 watts (7x120). Here’s an example of a list of common essential devices and appliances and how much energy they use: Total: 1,545 watts Some devices ...

Older refrigerators will cost from $9.90 to $ ... an incandescent light bulb will use 60 watts typically and cost about 0.6 cents an hour to run, according to the energy use chart.