How Much Electricity Does A Laptop Charger Use. A laptop typically uses about 50 watts of electricity the equivalent of 005 kWh. Even if I assume my laptop wattage to be 100 watt and use it for 24 hours in a day throughout the month I can expect monthly power consumption of my laptop to be just 72 kWh.
They use switching power supplies. Phone chargers use around 026 watts when plugged in but not in use. If its running a browser watching movies and general usage including running most desktop applications the laptop will use 10-15W.
Since the average cost of electricity is around 28 centsKWh here in San Diego my weekly cost is roughly.
According to my tests a genuine Apple iPhone charger uses about 130W of power a month which equates to 15KW h a year or 018 on my power bill. A laptop charger also wastes energy using 442 kWh when not in use and 2948 kWh with a fully charged laptop. When charging the laptop battery power consumption will increase 10 to 20 percent we estimate that 60 watts is average power consumption for a 14-15 inch laptop when plugged in. In 12 hours it will use 006 - 012 KWh.
